recently got a used blue metallic N3DSXL to experiment with CFW and play multiplayer games with my son (who's had a Pokemon N2DSXL for two or three years now); when I read about the screen debate I checked the info with 3DSident, it turned out to be a dual TN screens one (couldn't find dual TN N3DSXL in the vote on the thread's first page); oh well it works ok and I managed the CFW install, and I keep learning all the time so pretty happy.
I just happen to have another boy who's younger, but he knows he wants a console like his brother so I give him mine to experiment with me. But the prospect of doing multiplayer with the two of them made me want to get a third system, also used and as cheap as I can get. I found another blue metallic N3DSXL, and immediately installed CFW. I expected dual TN as well but found out that one has dual IPS ; go figure, maybe it's a more recent unit.
Anyway it's a real gamble and it must be difficult for people who absolutely want IPS; I still use the first one I got more, I'm still in the learning curve but I really enjoy it!