I owned the Hales T5s for quite a while, years ago.
I thought they were spectacular. They had among the most timbrally true sound of any speaker I'd heard. They had a particularly grain-free smoothness in the mids/upper frequencies (like Joseph Audio speakers which also use the Seas midrange). In my system they sounded rich and lush but extremely clear and extended, with a BIG sound and imaged and soundstaged like demons! One of the best speakers I owned.
I only moved on from the Hales because...well...I'm an audiophile so that should explain part of it :-)
But more specifically, the main knock I had on my T5s is that they were a bit too smooth, almost to a fault. That is, they seemed to slightly smooth away the textural presence, e.g. bows on strings etc, a bit too much. And they lacked some sense of dynamics and image density/palpability. (I actually talked with Paul Hales at the time just before Hales folded, and he acknowledge he had the same misgivings, which is why he had just then moved on to newer higher dynamic range designs).
I moved on to Thiels which had a lot of the tonal veracity, but had denser more palpable sound, and seemed more alive and dynamic. (And of course I tried lots of other speakers).
But every speaker has it's pluses and minuses. I found the pluses of the Hales so engaging that when it came to doing my home theater I sought out Hales speakers, so I have Hales Transcendence 1 monitors doing L/R duty, and the big Hales Transcendence Center Channel. It's just gloriously smooth, rich and timbrally beautiful and I wouldn't trade them for anything else at this point.
(I actually bought one of the last existing pair of T1s from Paul Hales himself, who had a pair in his office).