I've installed the Mimo G+ on friends Talk Talk connection going to a Desktop PC via Ethernet and wirelessly to a laptop with Vista Home Premium and there's been no problems with it. The laptop is working all over the house so not sure why you say Vista is no good with this router?
I've also installed the same model router for some other friends on their SKY Broadband connection which is connecting 2 laptops (one with XP SP2 and the other with Vista Home Basic), a desktop PC (XP SP2) and two XBOX360's all wirelessly without a problem.
Seems I've been lucky