Not to sound like a shill but I've had absolutely no problems in the past couple years. Long ago they occasional had quote issues at times. Any time I had an issue I'd go to MB chat and most times have the problem resolved right then. On the rare occasion when something was lingering I'd just email Ross and it would be taken care of quickly.
One thing I commend them for is having users make suggestions as to how to improve the products they offer. MB ranks them, does the development and rolls them out with subsequent releases of the software.
In the last 15 years I've been with 3 firms; All Tech for about 4 years, Tradescape for 3 (until they were acquired) and MB now for over 8 years.