DPL2, DTS Neo:6 and so forth are surround modes that extract center and surround info from stereo sources.
I use a DirecTivo quite a lot, and since they seldom transmit in 5.1 these modes whould be really nice to have. On DVD soundtracks (5.1) the 1050 is great. Moving forward I suspect the matrixed stereo formats will gradually become less important, but since the 1050 is pretty much entry level I doubt anyone would get it as a long term investment in sonic bliss.
Personally I can ssay if I'd known what I do know I'd have returned the 1050. It has great sound, but also oddities that I'd prefer not to live with.
If you decide to try it, arrange to give it a complete workout in your 30 day test period. Try the svideo switching with your sources, make sure you can live with the oddities of the volume knob, etc.
It is well made, solid, and highly idiosyncratic.
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Charlie