My 6500 died and I bought a 5010, when this was the current model. With 0 hrs on the lamp the calibration was very close right out of the box (I use Dynamic exclusively, as I can't notice the "green" issues in normal content and I like the extra lumens). It is quite a bit brighter than the 6500 (I'm getting over 1000 lumens after calibration @ about 16' from my 120' diag screen).
I was touching up the calibration every 100 hours until 300 hours and there were very little changes needed. I waited until 500 hours and between 300 and 500 something drastically changed. I had to significantly change brightness (black level shot way up to dark gray) and increase contrast (white level was very low). Also had to do a lot more work to get the gamma curve flat, but this was probably due to such a change of the white levels.
One thing that I have noticed is that the light output of this projector is not deteriorating at the rate of my 6500. Don't know if it is this particular bulb or the new bulb that Epson is using (I think it is a 230 watt bulb now, 6500 was a 200 watt bulb), but I have more confidence that over 1000 hours is not easily possible. I had bulbs dying in the 800 hour range on my 6500 (I think I had 3 go).
Hope this helps, as I think the 5020, and 5030 are just refinements of the 5010, so hopefully they will behave similarily.
It was quite an improvement over the 6500. I have since added a Darbee, which I really like, but of course turn off when calibrating.