Ah, the DX-7. Back in the day eveyone wanted one. I could only as close as the DX-100, a mini keyboard, 4 op. version, but good enough for my needs back then. Today, I would think twice before buying one unless I had a specila need for a sound or was a collector - too many better, cheaper boards offer the DX piano and other emulations. BUT, if your friend already has one, there's definitely nothing wrong with using it.

Cass