I just purchased a Sonnet Echo Expresscard/34 Thunderbolt adapter and started a thread on the Mac Peripherals forum about my initial impressions after using it with my 2011 MacBook Air.
https://forums.macrumors.com/threads/1294185/
The bottom line is that it works, but it could be better. My guess is we'll see this or similar peripherals in the $50-75 range within a year. At that price, it could be worthwhile to more people. At $150 (plus the cost of a cable), it's a pricey way to expand.
https://forums.macrumors.com/threads/1294185/
The bottom line is that it works, but it could be better. My guess is we'll see this or similar peripherals in the $50-75 range within a year. At that price, it could be worthwhile to more people. At $150 (plus the cost of a cable), it's a pricey way to expand.