I've had some experience of the v7 (including its buggy firmware, which tempered my initially favourable impression), discussed in threads on
DSLZone and here on
kitz.
The v6 is getting pretty hard to get hold of new, and as I discovered a few months ago, at least one supplier is shipping v7 to fulfil orders for v6.
('BNIB' offers on e-bay tend to be ISP-locked versions, so changing the firmware is a major hassle, possibly involving opening up the casing and using a JTAG to program the router via its internal serial interface.)
Hope this helps
rwm32