Personally, UDPP works for me equally as well as long-wearing cream eyeshadows (including Benefit Creaseless, MAC Paint Pots & Bobbi Brown's version). I actually prefer to use cream eyeshadows as primer as they're generally more opaque, which provides a bit more coverage for the eye area. Plus if I'm in a hurry then I cut out a step - all I need to apply is the cream eyeshadow (not UDPP & eyeshadow).
Personally I think Benefit's ones are fantastic, they come in some really pretty neutral shades. RSVP is a very nice shimmery beige-pink shade if you're looking for a basic shade to get.