I've owned 3 of these Tomcats, and like them.
First one was when they first came out - it had some jamming issues, so I sent it back to Beretta, and they replaced it with a later model that has had no issues since then (1998 time frame).
This second one is decently accurate - no issues hitting a 6 inch plate offhand at 15 yards if I do my part. Have not bag tested it for accuracy.
Bought an AlleyCat version maybe 5 years ago - it was the one with a large front night sight. The issue I found was that it made you shoot low, and I wasn't a good shot with it, so off to the chopping block it went.
As for the cracking issue - I though it was the frame that would develop, in some cases, slight cracks. I've not had any issues myself with mine, but I know other's have. There have been some posts on here about it with pictures and locations of where they crack. It's my understanding that the cracks do not impact performance or safety - it's a cosmetic only crack.
For a suppressor, you may want to hunt for a VZ61 Skorpion style can, made for .32 ACP. 9mm cans, while they would make it very quiet, are going to look big on it, if they are the more usual 1.5 inch diameter can bodies. Plus really obscure the sights and want you're aiming at.
I like mine, and it's a nice step up from a .22 or .25 small pistol. I'd say buy and blast. Beretta's keep good value so you can always sell it off, espcially the threaded version as they have just come out.