The vu+ duo is a fantastic receiver. I would highly recommend it. The vix images for it are v good too.
Realistically though the clone dm800 pro with rev M tuner can be bought for £140 whereas a duo is gonna set you back a good £320. I guess it depends on how flush with cash you are!
I can record a channel from 28 East and watch a channel from another sat or vice versa. What I cannot do is watch/record from two different sats if neither of them are 28 East.