So I've seen a few posts here and there reporting that the old Power Covers (the type cover with attached battery) now work with the SP3 after firmware updates in July. After seeing how much better battery life improved on the SP2 with the same cover, I was wondering how much longer your SP3's last with this cover instead. Since apparently Microsoft hasn't reported anything regarding a power cover for the SP3 I am strongly considering getting one of the older ones. Does anyone advise against this? Thoughts? Feelings? etc.