These guns interest me and I looked at the one on the EE too. I've not shot one but handled and looked at one very closely at a shoot in the U.S. a few years ago.
They are heavy guns. That suits some people for clay targets. IMO it would make a better trap gun than a sporter. The amount of the action exposed when it is open and that open air holder for the second shell make me wonder how well it would function in a Canadian winter.
What I keep coming back to and the reason I didn't pursue that gun on the EE is the price. The asking price of the UGB would buy two Beretta 391 Sporters or a customized 391 with money left over. I can't justify the money on a UGB when there are proven alternatives available on the market.