I thought Lion was really stable, so installed it on all my Macs. In fact, Lion is going to be great. So i've re-installed 10.6.7 10J869 on my Mac mini and discovered: - Snow Leopard really is fast and super stable, speed not a reason to use Lion currently - Lion really is quite buggy, especially Safari and server features and some Finder features and graphics drivers as well. - Wifi on Lion is patchy, unreliable and weak in comparison to SL - Lion's features work better with a MB/MBP/magic trackpad, rather than a (magic) mouse currently. So Lion can stay on my MBP (for now). Anyway, I can't wait for Lion, but my Mac mini is sticking with SL.