X32 Compact digital mixer + SD16 stagebox - Excellent value, used in my home studio, in the rehearsal room and live since about 5 years - never had a problem, great mixer.
Model D - Sounds good, tuning a bit unstable, needs a long warm-up and some minor recallibration from time-to-time (but not that different from a Moog I had 20 years ago). No technical issues, 5 years old. Unfortunately the firmware cannot be user-upgraded on my version, would need shipping to Behringer and I noticed this after the 3 year warranty …
2600 (Gray Meanie version) - Very good synth, a lot of fun to use, no major issues, spring reverb is quite noisy but I guess this is to be expected. 1,5 years old.
So no issues so far on my side with Behringer gear quality.