I've had one for about two years now. It's for storing bikes only. I have a large fleet,so it gets six bikes up out of the way. You have to interlace them,alternating front/back,which can get tricky when dealing with different bar widths/drop bars and wheel sizes. It would be a real PITA if you had to take more than one bike on/off on a daily basis,but for long term storage it works well. It's pretty sturdy;according to my bike weight chart(I've weighed all my bikes w/a digital fish scale) I've got around 156lbs of bikes on mine. It rolls ok;mine's on carpet so if yours is on a hard floor it should roll better. I'm too lazy,but the best way to hang bikes would be to remove the pedals and loosen the stems to flip the bars sideways. I use pieces of cloth to keep a couple derailleurs from greasing up seats. The 4' deal is a little misleading though. The base takes up 4 feet,but you have bars and wheels that will stick out further.

For actual storage it works pretty well,and the price is right. For daily use,you'd do better with a single or dual bike rack that's easy to get bikes on/off.