Lower backlight levels are surely sufficient, but I like it brighter and have it on level 4. There's also an "energy saving" option, which makes the picture look a bit different (hard to describe...), but I'm not sure what it does exactly.

Today I used my 3DS about 2 hours with 3D on maximum and I report: no headache. :)

So how easy/hard is it for you to find that "sweet spot" of seeing the 3D effect? And how easy/hard is it to lose the effect by tilting/moving the system?

I guess what I'm trying to say is: is finding and keeping the 3D effect a struggle?

The sweet spot is very easy to find, but you shouldn't tilt your head too much to the side.

During the first minutes (I always tried to look "behind" things...) I lost the effect often, but once I grew accustomed to it it didn't happen frequently.

That's good to hear. So the more you grow accustomed to the affect the easier it is to keep it. Very good! ^_^

I need to start saving money asap or I will have to wait till my b-day (in July) to pick one up.  Although it looks like Mario Kart, Paper Mario, Animal Crossing, and Star Fox are all going to be released around early June (in USA).  I think I would only be interested in Pilotwings and Super Street Fighter 4 on US launch.  Grats on your purchase I am sure plenty of people are jealous.  Let us know how long the battery last for you.

COngrats, I cannt wait to get mine... If you get layton pls report, I dunno if the game is coming here, but I would love to play it...

i heard it blinds your unborn children

do all stylus' work?  you know i got a zelda stylus (the feather) back in the day for teh ds.  will that still work if i ever want to use it on this?

You said you played full brightness, 3D for 2 hours.  What does battery look like? 

I don't see any reason why it shouldn't work.  They probably have basically the same touch screen and if a stylus didn't scratch/mess up the DS screen then it should be fine for 3DS.  Funny thing about DS is that I hardly ever used the stylus (except for a few games). 

after he's done with all the impressions then he can R.I.P., you're one lucky .... what's the word???.... guy