I grabbed a Tweaker 40 from GC about a year ago. The two sides are identical, but on the one I got one side didn't work right. I played with it for a bit on the good side to get a feel for what it could do. I liked the Vox setting though I'm not sure how true to a Vox tone it is. The amp actually had some good sounds and feel, but seeing as it had an issue on Ch 2 I took it back. Unfortunately it was my 2nd experience with Egnater and the first was new out of the box (Renegade) and quickly developed a problem with the tube blend pot on one of the channels. It went back as well and it was a shame because I really like the tone and feature set of the amp. At that time I moved to a US made Egnater Mod50, which was awesome and the Voxless Jaded Faith module was killer.
Not sure if I'm helping your direct questions here, but I've seen the well documented quality issues ring true. I so wish it weren't true as I still really want that Renegade, but keep having to stop myself from getting into the highly probable headaches.