Been very happy with my AE300 so far (1596 hours and counting), but have a few quibbles.
Dust globs. Had 'em. Lots of 'em. Had to open up the entire PJ and used an air compressor to get them out. Took me a few tries before I had them all. They really annoyed me, especially when watching 4:3 material. I was constantly looking at the green blobs in the black bars. Long live wide-screen!
HTPC woes. Each and every reinstall of my operating system I have to fight with drivers, powerstrip settings and what not to get my custom resolutions to work. Even then, after I get my desired 1280*720, I have to keep tweaking, because the pj sometimes flicks from wide720 to XGA mode for a split second for no apparent reason. Fooling around with the powerstrip settings takes care of this, but it takes me a while to get it right, because the mode-change sometimes only happens once every couple of hours. Why this happens, I don't know. I've saved my powerstrip settings, but have to fiddle each and every time. (I know, I shouldn't have to reinstall my PC so often, but I live with this machine 24/7. It's used for gaming, movies, television, surfing, mailing, testing beta soft, tweaking and general messing around.) I have an ATI 9800 dual head, with my normal 22" Iiyama CRT on the VGA port and the AE300 on the DVI port with the VGA converter, so it is indeed using VGA. (I can tell because I can't get 1280*720 to work with DVI.) I need new drivers for my games, so every time ATI decides to drop one on us, I have to go through this hell.
(Question for RickS: What resolutions do you use? How do you get the 1920*1080i, the advertised AA resolution, to work properly? We have the same setup, would you be willing to mail me/tell me just what resolutions, settings and timings you're using?)
Admitted, this doesn't really say anything about the L300, but to me it's a big part of my life with this PJ. What does concern the L300, is the fact that we can't get a real 1:1 mapping when using HTPC.
Flickering. Not very apparent when watching a movie, but when I have the desktop on the PJ it bothers me to no end. Now that I know it's there, I see it on every source I use when it starts to flicker. Component for GameCube and Xbox as well as VGA with the HTPC. It flickers in 50Hz as well as 60Hz. It doesn't flicker all the time, but every so often it does. I thought at first it was the lamp, but a friend of mine with the same AE300 has the same problem. I'm considering sending it back to Panasonic before the warranty runs out.
Other than that, it's been a wonderful 9 months. It has given me a reason to revisit some of my DVDs that otherwise would just have collected dust.
Friends and family are impressed everytime they see it in action. At first they thought I was mad, collecting DVDs at the rate I do. Now, after seeing them on the big screen, the finally understand ;)
I can't really compare this pj to any others, considering this is my first. In the beginning I used a sheet, then I upgraded to a Projecta screen. I couldn't be happier.