Hi Jim,
I had issues with the amount of time it took them to complete the work and also had a few quality issues that Pete had to address.
Estimate was for about a month, it took well over two to get done. I had a GNS530, GTX330, SL30, audio panel, STEC30 put in. Most notably, the GNS 530 wiring to the cockpit lights was screwed up and when I flipped on the interior lights the wiring fried and burned out the 530. To their credit, they took care of it quickly.
I also found they only cut and capped the old wiring, leaving a mess under the panel. I'd really push them to clean that up if I were to do that again.
Might be better to talk if you have more questions.
Bill