We chartered a T51 in Miami a few years ago. Unfortunately, it was captained so I never got to pilot her myself, but with me, the capt, 1st-mate and 11 friends, we got a good taste of her accommodations. Like any charter boat, she had seen a LOT of use, but she was holding up impressively well. QSM-11's enjoy a very good reputation and IMO, are a perfect fit for this kind of boat. I didn't have a chance to get into the ER, but they were smooth, quiet and smoke free.
The salon is great, with a comfortable layout that's good for conversation as well as watching TV. The lower helm is BIG, with the dash panel extending to a rather odd space above the companionway. The big helm comes at the expense of the galley and to some extent, the dinette. The galley is wedged into a corner with very little storage for a 51, and the dinette requires some sliding and squeezing - once you're in, you tend to stay in. Fit and finish is really nice. The Miami boat had carpet in the salon and staterooms and teak in the galley. The teak is high-quality and showed no wear. We obviously didn't spend the night with 14 passengers, but the staterooms showed very well, as did the heads.
I think the T51 is very good-looking and before that charter, I had probably mistaken them for a Viking/Princess. The Euro influence is apparent on the bridge, which for me wasn't a good thing. The bridge is the low-profile style that Azimut and the Brits were doing more than a decade ago and that now the U.S. builders are doing. The arch is low, the seats are low, the upper helm is small and AFAIK, a hard-top was never offered. In fact, the Miami boat didn't have a top at all. The bridge is actually large, but the layout provides relatively little floor space.
With a different bridge layout and a hard-top, the T51 would be one of my favorite boats - and even so, I'll be jealous if you get one!
I bet you would also like the Neptunis 56. They're very similar.
The specific model is the T51. I am watching a 1999,2001 and 2003.