Seems like your AV has gone through already!
As for the Raffica, its a solid gun with crisp blowback and sound. Shoots a little hot for indoor, but is a great secondary for outdoors. However there are a few things that I have personally noticed. My roommate owns one.
Clean and lubricate the gun often. From what I've seen it requires more maintenance/cleaning than other gas pistols. One of the most common issues with it is the nozzle breaking after some time if not oiled properly. It essentially gets stuck and then splits in half when the gun is fired.
Also, the fire selector/sear may get finicky after some time. Burst might fire in semi or semi might fire full auto. Someone else would be able to confirm and explain this better.
One other thing, its sometimes difficult to find spare parts for the gun. Unlike other pistols, you can only get parts for it from KWA or KSC. Aftermarket parts (especially for the M93r) are almost non-existent. Some retailers here can get them from their suppliers if stock is available, but we had to wait almost 6 months for KWA to get a new shipment of nozzles in stock.
If you're only looking for a full-auto pistol, I'd suggest the TM Hicapa Xtreme or even a TM/KSC Glock 18c. Lots of aftermarket reinforced parts are available for them if you ever need them. Full auto pistols will always require maintenance and repairs. Its a tradeoff for the full auto capability.
However if you're specifically interested in the M93r, then by all means go for it. Some people swear by KWA while others have had bad experiences. As long as you take care of it, you should be fine.