I have an AW 30cc Extra 300 that although it is a very nice flying airplane, had some build issues. As the little things began to pile up I decided to politely point out things that AW might consider. My comments were in no way a condemnation of the airplane but that's apparently what AW felt. Here are just a few items:
1) Very loose covering (yes I know about temperature, humidity etc.,) but my comment was that I had ARFs that cost a lot less money and had fewer wrinkles. The response from AW was as though I never built an airplane before.
2) The "T" bar for the steerable tail wheel was missing from the parts kit. I made one and never heard from AW regarding the replacement they offered.
3) The recommended twin elevator servos could not be fully inserted because they hit each other. Shims were needed but not addressed in the manual. How nice it would have been to recommend servos that fit without shimming.
4) A friend with another Extra 300 warned me about reinforcing the gear mounting area. The short metal plate added to the side plywood frame would tear out of the plywood on even a hint of a rough landing. I checked mine and sure enough, one side was cracked. The new kits have a longer plate to spread the load so it was a known issue.
5) The hitch pins used to hold the wings in position go through stubby aluminum tubes that extend into the fuselage. Those holes are drilled vertical but the hitch pins are too long so they are difficult to insert due to interference with a flat ply canopy/fuse surface. Drilling those holes at about a 15 degree angle off vertical was suggested and again I was blown off as "get used to it".
6) Pin hinge holes were not drilled full depth. Good thing I trial fit things before epoxying those in. Again, nothing in the manual about drilling those to the desired depth.
7) Wrong bolts were sent with the DLE-30 engine. Not an AW issue but something they need to address with their supplier.

These are just a few of the issues I related to AW. During the final stages of construction I decided AW was not interested in constructive comments so I quite documenting things. As I said, nice airplane, flies nice, and looks nice. A little attention to detail and a bit of work in the manuals would go a long way to alleviating annoying assembly issues. I will not say I will not buy another AW model, but I will give it serious thought and look closely at the on-line manuals -- if they post them..