I started putting together my home gym in June of last year. So far I have a Powertec WB-LS, a set of Power Block adjustable dumbells, an olympic bar, an e-z curl bar, and a Precor crossramp elliptical.
The Powertec is build pretty solid and I really like the movements of the high/low pulleys and the press arm used for bench, shoulder press, squats and shrugs. The leg and preacher curl attachments are okay, but have kind of a wobbly feel to them. You can find Powertec stuff for a lot cheaper than the prices that they have listed on their website. I think I paid $650.00 for mine. My buddy has the three station Powertec gym and I think that he got it for $900.00. I also had to buy additional attachments for the pulley's, since it only comes with a straight bar and single hand attachment.
The Powerblocks are awesome and I have no complaints about them. I thought that they were going to be awkward to use, because of their shape, but they aren't. I use mine with the bench from my Powertec machine, since you can drop the Powertec's press arm completely down so it that its out of the way.
Hope this helps.