I own a directlift 4 post.
Cost and reputation were my selling points. Cost mainly being due to the fact that being in Canada, I had access to only one distributor of 4 post lifts, and they sold the rotary brand, which were VERY high in the price range up here.
I was able to get the direct lift freighted up here to a loading dock and used a rented flatbed to pick it up. Assembled it myself with 2 buddies.
While it may be the cheapest alternative in the 4 post market, it is extremely well built, and I have not had any problems. It is not quite as "thick/tough looking" as some of the others, but I have not heard anything bad about them either. I have read through customer reviews/posts on most of the major message boards...corvetteforum, viperclub, camaroz28, ls1.com, ls1tech, ferrari, bmw and haven't heard many bad things about them.
However, being in the states, you have a few more options than I did, we get killed with duty and taxes up here.
I can get some pictures if you like.