So, three years ago I bought what I thought was a "future proofed" Apogee Symphony i/o (the original one, not the Mark II). I've come to discover that, while the modules are upward compatible, the chassis is not. Further to my chagrin, the older modules are not dropping in price. If anything they are inching back upward due to people like me being locked into the old chassis format. I vow to never again purchase Apogee gear.