Got that MWave/Ebay Bulb today, and I compared it against one that I already had on hand( I have 2 bulbs, they are exactly the same-Original and the replacement that came in a white box)......
The heat shield on the left side is a little loose, I had to tuck it in where it belongs and tighten it a little, the back of the bulb housing wasn't clipped in real tight(a clip), I snapped it in better, the little tab of plastic that holds the power plug on the right side and the back plate was not glued well to the back plate, I put a small dab of cg.
The housing/setup is a little cheesier, but it seems to work fine.
The back of the bulb reflector housing/connections are a little different, these are made in China, and definitely not at the same manufacturer.
I had an issue trying to get it to push in enough to connect up to the power plugin, and I couldn't figure out why......the plastic back(where the handle is) must be just a smidgin taller on mine(or just a bit sloppy), as it didn't want to go past the screw(faces down) that is inside the bulb cavity so I gently lifted it up and past that screw with a small screwdriver- you may not have this issue, and you could gently file where that screw goes and they probably wouldn't even notice it if you do.
I use this as an everyday/all night unit, the PJ has almost 19K hours on it between 2 bulbs which both still work(~13+6)....we'll see how this one does, but at $80 delivered it would have to burn out quick to not be worth it....my last 1 was $309, although I have seen them for mid 2's since.....
We'll see, working fine so far, and the timer has been reset!