I'm with Tom. The MX-850 is better, due to the new select button, which has been separated from the rest of rht directional thumb pad. If you look, none of the newer models have the one-piece directional thumb pad anymore. This was a very conscious engineering choice.
If you would like a free consltation, you are welcome to call me at: (914) 509-5360. We also offer programming and have got some great hoilday specials going on right now too. :)
Thank you,
Damon DG
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http://www.ProRemotes.com - Authorized Dealer & Remote Programming Services