I've also been a user since 1.0 when it was first created as a drawing aid. Since then, the program has switched many hands (fractal, metacreations, efrontier) Not really good (of course) and ever iteration has added more lumpy sacks of coal for a mule that was never designed for this. Features have been packed onto a legacy core. Its knees buckle and its spine has grotesquely ruptured discs.
First thing you'll notice is that it's slow. dead slow. Loading certain figures can take over a minute. The library's format and structure is ancient and is a serious PIA when you begin to install third party content. (DAZ, Renderosity) Expect countless folders with names beginning with !!! because content developers are fighting for dominance within your installation. You'll shake your head in disbelief and spend countless hours reorganizing folders.
The content community however, for clothes, characters etc. is very much alive and active. There are legions of fans, and I for one atribute this to the programs relative ease of use. While definitely sporting an unconventional/proprietary UI is of much debate, i found it easy to use. Though, the more serious you become with it , the more you'll realize it's limitations. It was designed from the ground up to be a simple application, and this is no longer in it's favour.
It feels as though the core program has aged and introduced hacks as a means of low-budget feature evolution. MATs, python scripts, etc.
Thanks to e-frontier for continuing to make a mac version, but this is one program that's due for a MAJOR overhaul or complete rewrite. (ha good luck)