OK, FINALLY I have my new HP2.4 (white) screen. To recall, I sold my 4 yr old 2.8 HP (110x62) because I wanted a larger screen. It sold quite fast (and the new owner is very pleased with it--had to be shipped from CA to GA, but made it fine). I had planned for several weeks to look at the pic on the wall, to be sure of exactly the size I wanted, and how the pj (RS20) would work with it, etc. Unfortunately when the new screen arrived it did not have the ProTrim material on the frame, as I ordered it (and my dealer correctly ordered), so had to wait for another one to be made and shipped (all at Dalite's expense--they are a standup company!). It arrived yesterday, and I put the frame together last night, and today my daughter and son-in-law helped me snap on the screen material and get it mounted on the wall.
I settled on a 'hybrid' size, 144x72 (2.0 W/H ratio), to have a 16x9 pic that is 128x72 (with black bars on the sides) and zooming for a 2.35 pic that is 144x62 (with blacks bars above/below). This all works great; I'm very pleased with the result, though I would certainly enjoy a pj with lens shift/zoom memory. (I sit ~ 12 ft back, so 1.0 screen widths for 2.35, and 1.1 for 16x9; i.e., pretty close, but that's what I decided I wanted--and I LIKE it.)
My RS20 has over 1800 hrs on it and is down to ~ 300 lumens, so I was assuming that I would need to get a new lamp, but to my surprise the pic looks very good, even though this amounts to only ~ 11 ftL. I do, though, have ProtoStar 'flocked' black material on side walls and ceiling, and no external light, so that helps a great deal, as well of course, with the eyes' amazing way of adjusting. Still, I'm sure I will like a brighter pic better. (Am planning to do a pj upgrade this fall, so not sure whether or not I'll get a new lamp or not.)
The HP2.4 shows a beautiful pic, so smooth, with absolutely no hint on hotspotting or any artifacts. Probably better in this regard even than the HP2.8, though I never had any problems with it. Viewing width is no issue for me, since this large screen goes almost wall to wall. Brightness uniformity is excellent over the hold screen.