Since this is kind of turning into an ARF quality discussion... What company provided good experiences? ...bad? ...customer service? etc.
Global - good in general. The bad pieces were replaced.
World Models - I've only done one, a P-39, and it was well made.
Hanger 9 - No complaints at all.
Thunder Tiger - one really good and one really bad. The bad one's wing ribs were constructed of a lightweight brittle material resembling balsa that pulverized themselves during shipment. The wing looked good on delivery but flexed and rattled as I picked it up out of the box. Good customer service though - new wing in a week and I flew that thing for 6 years.
I have a number of planes but will just mention a few as to relevance here.
Great Planes - Revolver 59 and 70 - both well built. Some light re-enforcement depending on flying style. Good manuals. For the price the 70 was built as well as a high-end plane. The only issue I had was a slight mis-alignment of stab hinges - I got mine for 204.00 from Tower. Will buy from again.
Hangar 9 - Pulse 40 and Twist 40 - Cannot state much on these. Good manuals. The Pulse built a little weak, but after 400 flights I will hold the comment. The Twist due to design needs some strenthening and some of the hardware was crap. Would buy from again.
Sig Mfg - 300XS 40cc - Good manual - well built -did some mods because desired to do them. Would buy from again.
AW Extra 260 60-90 - reasonably well built, a little thin behind cockpit to tail area - not sure it was worth the extra price over the Rev 70 though. Extra nice manual. Depends on the price compared to others vendors.
Extreme Flight 50cc Extra 300 - very well built and braced in areas that is needed. Nice airframe. Good manual. Would buy from again.
Precision Hobby Products - 26cc Edge 540T - blow out sale - a disaster. Manual a joke - not even for the correct model. One of the shoddiest builds I have seen. Mis-advertised and makes some of the CMP planes look like champs! Box states QB (quick build) - no way. Hardware a total joke (missing hardware and not one thing fit anything), hinges horrendous (removed them with a small pair of plyers!), mis-aligned holes, crooked drilled holes, landing gear are some sort of fiber material, wing tube not aluminum but some sort of thin alloy metal, etc. Looked like something you would give a 100 bucks at a yard sale. I could go on and on. I will state that after sending pics to PHP they said a few of these got out this way and they would take the wings back if I paid freight both ways. It was not worth it to me at all. Extremely doubtful I would buy from again unless I am able to inspect the plane before purchase and it met certain requirements for the price I pay. I would just buy a crashed plane and fix it.
Also several home builds - heavy and tough as nails! If I can think of some more that I have I will post as this will be helpful to others.