I played around a bit with this when we first opened. The super-cleanability is great. Can we call it the "ghetto bottomless"?
I didn't like the instability when tamping and we do split shots, so I put them back on.
On a related note, I don't understand why you'd use that little cover that screws on to the top of some double spouts. Mine came off week #2 and have not been back on since.
Although split shots often give different volumes in the cup, I would say that if you never get the same volume from split shots then you need to work on tamping level. Another thing that is easier to do with a bottomless PF.