They have their quirks. I bought one recently on a whim and have now (mostly) satisfied my curiosity.
They are fairly heavy (compared with my Browning Broadway Trap gun) at 8.5 to 9.0 pounds. The version that I have has the 28" barrel and the adjustable cheek piece stock. The range of motion on the cheekpiece will suit most people. The recoil pad is also fully adjustable, although not so much as a Morgan adjustable pad. The length of pull is easily adjustable, which is nice. There is also provision for adjusting cast-on/cast-off of the stock at the wrist via the use of special spacers which should be included with the gun. Also, the wood on my gun is pretty nice with some decent figure.
The action itself is quite complicated. I would sincerely recommend that you do not buy the gun unless it comes with the manual. The manual is half an inch thick and I would suggest you read it. There is a lot of specific information on how to disassemble the gun, how to clean it, how to adjust it, etc.
Many people on the web say that the gun is extremely difficult to disassemble. This is actually not true. It is easy and quick, provided that you understand how it works. It takes me 10 seconds to take my Browning apart, and perhaps 20 seconds to take the Beretta down. You just have to do it the right way... and practice it a bit.
I shoot the Beretta fairly well, although it took some time to get used to it (and I am not all the way there yet). I still like my Browning better, but that is just me. I've put close to 40 thousand rounds through the Browning and it feels like it's a part of me.
The only quirks with the Beretta are that the but pad fell off during a registered shoot (only happened once), but of course, it took only about 15 seconds to put it back on as it is held in place with a sliding spring clip. Also, the chokes in my gun tend to work loose after a few hundred rounds.
One more annoying thing is that there is no shell-catcher available yet, and I'd rather just drop my empties in the bin provided (or a vest pocket) instead of scrabbling around on the ground for them. They do, however, eject uniformly a little in front of your feet rather than across at the person next to you.
There is another fellow at the club and he really likes his. I have not shot doubles with mine, but I have watched him shoot doubles and the UGB functions flawlessly in transfering the second round from the side clip into the chamber.
I would strongly recommend that you find one to try first if you can. I had very rarely shot an autoloader before buying the UGB and it was a big change at first. If you shoot an autoloader already, then perhaps it would be easier for you to adapt.
Good luck!