It was pretty confusing to see that most of this instrument was pretty good quality and had a really nice sound, which was was totally let down by the quality of the left hand palm keys. The high f key moved from side to side so much that that it got stuck open on the post when played. Also it was clear that the pads of the palm keys had been re seated, so there were 2 eccentric circles on each of these pads. Plus, they were a bit dirty where they meet the tone holes, and there were lumps of shellac or something on these pads (and only these pads). I guess this build quality was what caused the warbling effect at some dynamics from low A down. Could play soft. Could play loud. Could not play in between. Could not get a clean crescendo. Had to send it back, which is a shame. If the palm keys were assembled like the rest of the instrument, it would be fantastic. I have a feeling this instrument fell though a crack in the quality check. I find it hard to believe Thomann intentionally sold it like this.
Had no problem returning it. Customer support is great.
I think I'll try the Thomann Mk IV handmade or a custom model....