It is, and the main reason I use it are the two SRX expansion slots. I like the Roland SRX expansion library a lot.
Don't you have the Integra-7, which has all the SRX expansion boards built in? Why have the SonicCell, too? Just curious.
No, I used to have one, sold it a year ago for 1,050 Euros, as I have to finance several expensive medical procedures. At the same time I'm starting to switch to software libraries. I currently have one SonicCell with SRX 02 and 06 and a MoXF.