I've been pretty quiet on this this thread since I'm living in the last model year with my HW30. FWIW, I think the HW30 is a great projector and a year later (with 750 hours or so) I wouldn't have changed my decision. It's excellent in every way except for lens uniformity. The good news is I've only ever seen it with test patterns, not in real content.
Its been about a year since I got my HW30 and I wanted to revisit the lens uniformity. I couldn't find exactly the right test patterns, so I ended up creating my own. I wanted to be able to focus with a single color (Green) and then add Red and/or Blue. The goal was to check for focus independent of convergence. If you are only displaying Green and you are see oddities in some areas of the screen while the image is sharp in others, that's a focus issue. Also, if green is sharp then, with no focus changes, blue and red should individually be sharp. I would argue that if you cannot get R/G/B focused tightly then convergence is the least of your problems.
Having said all that...
I'm interested in how the HW50 model's lens behaves. If someone with an HW50 has a few moments and a computer hooked up, please try out my simple convergence page. It's athttp://www.aaarpinball.com/Miscellaneous/p1080.htm
1) Single pixels spaced every 5 pixels
2) "Plus" signs (10 pixels high / 10 pixels wide)
Each of these two patterns comes in 6 variations: Red only, Green only, Blue only, Red+Green, Green+Blue, Red+Green+Blue (aka White)
There are 12 buttons on the top to pick the appropriate pattern/color.
If you want to give your PJ a focus workout, do the single pixel green test and see if that dot is clear all over the screen.
I'd love to hear how the HW50 handles this... and for that matter, I'd be interested to hear about any of the other PJs.