Tim Higgins exhaustively reviews Linksys's rendition of Airgo True MIMO technology: TIm runs the Linksys unit through its paces, and notes that it does deliver as promised on range and throughput. But in his conclusion he states points I agree with: for three times the cost of a regular extended range 802.11g access point, it's only worthwhile if you need additional range or throughput.
Tim wrote: "At least for now, no matter what moniker it goes by--True MIMO, SRX, Pre-N, VLocity, RangeMax--MIMO is just another non-standard performance-enhancement technology. It doesn't solve WLAN problems caused by an already over-crowded 2.4GHz band and has a snowball's chance of being compatible with 802.11n gear that won't appear until sometime next year. But at least Airgo's True MIMO flavor delivers the goods for unequalled throughput over range performance."\
Tim's more optimistic about real 802.11n gear appearing next year. It's possible we won't see future-proofed 802.11n--devices that can be upgraded to the final standard--until 2007.