For the record: Depending on version, we will spend $150 to $170 (Pro) for the Sonnet Echo. Still way cheaper than the UAD Satellite which comes in at $900 for entry-level model.
As for the question of investing in a "new platform", I'm with egozot... not ready to buy into Firewire (Satellite) when Apple has clearly abandoned it also.
As of this writing, keeping the ExpressCard going is the only thing which makes sense for me (and perhaps others). All this is moot for now since my MBP still has a lot of life in it and I'm not ready for a new one where I'll be forced to commit to something.
Thanks to all of you.
LP 9.1.8; OSX 10.6.8; MBP 2.66GHz i7; 8GB RAM; 256GB SSD (sys); Apogee Duet One; 500GB Glyph 050Q Ext FW HD; 1TB Glyph 050Q Ext FW HD; Superior Drummer 2.2.3; Melodyne 1.3.0; UAD-2 Solo/Laptop; Focal Twin 6 Be; Cinema Display 27.