I went out on the maiden voyage in the cat yesterday and a couple things came to mind as I was cruising around testing things out. They may be of use to you - maybe.
1) a cat rides totally different than a monohull;
the first time I took her out it was blowing like mad. Yesterday was a easy ride in 10-12. That said as I was passing a large monohull that was slapping the water I was really grateful to be in a cat.
2) it doesn't take much to convince people about a cat's ride, my buddy was totally sold on the ride. "We're so going offshore in this beast."
3) while she can do 40, cruising at 25 is where it's at. I had my buddy drive more than I just because I wanted to sit back and enjoy a cold one. We hit 40 just to see if she could do it a couple times.
4) trim, trim, trim...it's all about trimming her to get her to run like you want
Now the downside...
1) two sets of impellers are on the way - they just need replacing; as well as extra lower until oil, and extra 2 stroke oil (hpdi's), and two colwling covers...2x on everthing
2) there's a blockage that needs resolving - although the telltale is working and doesn't appear to be overheating it's "just not quite right"
3) you gotta get the trailer really wet and way down there to launch/recover
4) storage is a hassle at 10pm at night; no more putting her up in the garage
5) the gas station blues will kick in soon enough - it's a challenge gassing her up - two separate tanks mean moving her twice to fill up; much less two 90 gallon tanks - cha-ching.
I think the best way to phrase it is the Glacier Bay (just like a TC) is basically an RV on the water. You're not going to blow the doors of anyone, but you will definitely get there. In sloppy conditions probably before others.
No regrets on passing up on the 22' and 25' - for that matter the TC, but the GB just fit my lifestyle a bit better.
Stay thirsty my friend...