i personally own four ARES/STAR guns. i have an L1A1, a Mk43, a DSR-1 and a AW338. i used to own one of your L85s. one of my old roommates had one of the older STAR FNC's. i think its safe to say i have pretty extensive first hand experience with your products, and with what i am assuming is your predecessors products (STAR).
when i bought my first STAR/ARES (henceforth referred to as simply ARES, although i understand there is a difference) it was the STAR Mk43, and i bought it because i have always had a hardon for M60 derivatives and the previous owner was selling it for a song because the magazine was garbage (the feed drive motor wasn't nearly powerful enough to keep the gun fed). i bought it for a fraction of the retail price, and i was fully expecting that the polycarb gearbox (which i understand is one of the larger complaints for people with your replicas) would blow up. i purchased one of the newer ARES box magazines for it, and replaced the hopup bucking (it kept folding over with BBs and jamming). since then, the trigger switch has burned out but that is to be expected. it is to be expected because i have put in excess of 50,000 rounds through that gun without a single gun-related problem aside from the switch. to put it mildly, i was blown away. the Mk43 is still my favorite gun, in fact i'm holding it in the image in my signature.
my other experiences with ARES have been mixed. the generality of it is i love the external build quality, but there is almost always something lacking on the internals and its always something that seems like it could have been fixed at the design/testing stage, and should not have been overlooked considering the price of the guns. here are the impressions of the guns i have owned/handled extensively:
Mk43: like i said, loved it. BUT the bucking was garbage (should have been caught at the design/testing stage, the material was much too thin and pliable) and the drive motor in the box magazine was a joke. i understand the box mag issue is fixed now, as i purchased one of the newer ARES magazines and haven't had a problem since.
L1A1: i love this rifle as well. a lot of people will complain that it is semiauto only, but so is the real L1 so who cares what the uninformed think. my main complaint with that rifle is the lack of availability on magazines (ive tried and tried to find them, and everywhere that lists them is out of stock

). another somewhat less serious complaint is the hopup design, while simple and robust, lacks rigidity and therefore suffers on long range accuracy which seems like a major concern in a weapon of that length.
DSR-1/AW338: im lumping these together because they were both bought as more or less show pieces. i do have a plan to convert the AW338 into a single shot 8mm gun, but that's in the future. the build quality is great, as usual. they both look and feel great, and they perform acceptably but i would never use them in a game as they are FAR too heavy. i can get better performance out of my tuned up KJW M700 for a fraction of the cost and weight.
L85: this gun was a nightmare. it never worked right, and was a horror to do anything to the gearbox/hopup aside from changing the spring. whoever decided an airsoft gun should have the barrel/hopup semi-permanently attached to the gearbox should probably get more into the sport as a hobby so they can see how unfeasible that is in the real world where electromechanical components break and need to be replaced at least somewhat easily. as with the others though, the gun looked and felt great. if you gutted it and put a more standardized gearbox and hopup into it, it would make a great rifle for the british players, which i think is a somewhat untapped market.
FNC: the burst was neat, but it never worked right when you needed it to. the polycarb gearbox developed visible spiderweb hairline cracking within a few months and a few thousand rounds. it was when they were first released though, so my guess is it has gone through revisions since then.
my overall impressions of ARES are favorable but there seems to be a lot you could work on, especially at your price point. when someone pays more than $400 for a gun, they want something that looks and feels great and also works great. i am not as against the polycarb boxes as i was now that i have my Mk43, so long as they are well made. as others have pointed out, my suggestion would be along the lines of working to increase reliability and parts commonality with the rest of the market, and lowering that price point. i worked at the largest airsoft retailer in oregon for a couple of years and i remember when those $150 G&G plastic guns game out. they were solid guns, performed well, were upgradable and compatible with most parts and we couldn't keep them on the shelves. when i moved on we were running out of them about every two weeks.
and that is my feedback with ARES/STAR products. while we have you here, i am curious to know when and why the split between STAR and ARES happened, and what the key differences are. i have heard different things from different places but i would love to hear it first hand. if you would like to discuss any more of this with me, feel free to send me a PM here on AirsoftPacific and i would be happy to talk with you guys.