I don't have experience with this cab, but I have owned a few Trace cabs in my past..:
1153 (compact 1x15, cracking)
2103H (2x10+horn, meh)
1518 (big 1x15, the new one and the best Trace cab I have owned)
The 1153 lacked a real big bottom end, the new 1518 more than made up for that. The top end on th 1518 was there but not harsh like I felt it was on the 1153, a much smoother treble roll off. No loss of clarity but then I don't like tweeters, hence why I think the 2103H was totally crappy (the tweeter in it was pony, and the Celestion woofers were a bit poop too really).
I'd be interested ot hear the new 1528 cab, I reckon you'll be pleasantly surprised how it sounds but at the same time I would trust the opinions of Alex over the technical blurb on the Trace site!! Knowing some of the amps you've had in the past I suspect you may miss a tweeter.