I had the 533PT's for the full 30-day trial and, while intitially a bit harsh they did smooth out after only a couple of days. At first, it was bad enough that you go "wow, what was that?" but they really did mellow out quickly and are a very enjoyable set of speakers for music and very clear for HT. That said, I just returned them. For anyone interested, Aperion does indeed stand behind their return policy. One phone call and I had my shipping labels in my email an hour latter. Called FEDEX and they picked the speakers up the next day.
So, if I like these why did I return them? Not quite enough impact with the two small subs. They are excellent for music but just not what I wanted for HT. To replace the PTs I ordered an Outlaw LFM-1Plus (just managed to catch the end of last month's sale) and yesterday ordered two 533T, 534VAC and two 534SS. I was considering stepping up to the 633T's but they're on back order. Guess I'll try out the 533T and then consider upgrading to 633T if I think it's necessary. I'll let you guys know how these sound once everything (including my new Onkyo 805) arrives.