My opinion based on personal experience:
An excellent gun,well build, accurate, almost perfect ergonomics (the all metal Jericho is better in this aspect), 100% reliable.
Magnum Research customer service is very good. Spare parts are currently available from Magnum Research. IWI-US, the current importer, has no spare parts.
Specific accessories are hard to find and/or expensive. I found that some SIG 226 and Glock holsters may fit quite well. Magazine are available and not too costy. Any standard magazine holder should do.