There are no game stores in my town as its a small town, in the next big town the local GAME store closed down when they nearly went bankrupt, there are no stores that have demo units short of travelling 20-30 miles, so I took a punt and ordered one online.
TheLegendofMart, where did you buy your 3DS? Usually stores have consoles set up for you to play. Perhaps you should have tested it first to make sure your eyes could tolerate the 3D effect?
Personally, I don't use the 3D much anyway. It's a bit fun for some games and some sequences, but largely I turn it off. I am hoping DS games look better on the XL because I never owned a DS and I'd like to play some of the good games that were on that system.