I bought the HF 2hp unit, it pulls a bit over 10amps at the most I can load it, the same amperage as my 2hp Grizzly table saw motor does at most cuts. The bags were never installed upon the machine, instead I sold them on Ebay.
A wynn cartridge sits upon the unit and does a lovely job of getting the fine dust which goes down the line, and there is a quite a lot of it.
Not as small as the little 1hp -1/2hp with the bags sideways, they will not store much work from a planner before being completely filled up though.
When I get to build my larger shop, I hope to move to a large cyclone with 3-5hp. On a tablesaw you also NEED the overhead guard, just too much gets off the top of the blade.