[blucar]

I have a four post "Bend Pack" 10K lift.. I did a lot of research on hoists before I purchased mine.. The twin post lifts has several good points, however, I had concerns about picking up vehicles on same.
One of the advantages of a four post, if you have a high enough ceiling in the your shop/garage, you can store a car on the hoist with another car under it..
It is a little difficult to work on suspension items on a four post because the wheels are sitting on the ramps, where-as on a twin post the wheels/axles are hanging free.
Of course in many cases you will have to have an axle jack/stand to remove a differential. Another expense that is not apparent until you try to do same.
Axle accessories are available for four post lifts, they fit onto the ramps, sliding out of the way when not in use.. It is advisable on many vehicles to lift the weight off of the suspension prior to lubricating springs/bushing, so the axle lift accessories are a must..
One very big plus to a twin post hoist.. Removing car bodies from the chassis..
With a little bit of planning, lifting a body off with a four post can be done...
After all is said and done... For the average car nut, I think a four post is the best bet..