The sweet spot IS TOO SMALL, the battery life is nothing compared to the DS lite, and the add-on is a huge $20 hunk of plastic that ruins the portability of the system.
I bought a 3DS (for for about $300 including a game) knowing it had no 2nd analog stick, but I didn't think Nintendo was going to release an add-on, along with games that are supposedly better with it (basically Nintendo saying they fucked up). It's along the same lines as holding back game features, and releasing them as DLC you have to pay for.
It's $60 to play Resident Evil: Revelations with the add-on. $60 to play a portable video game (not drive a race car) the correct way. That's outrageous. I don't want to have to pay for Nintendo's supposed mistake. This bullshit is reminiscent of the motion plus. Barely any games used it because developers knew it was asking a lot of their customers. Make a games console that works correctly out of the box.
Nintendo really needs to get their hardware straight before they release it to the public.
I bought one @ launch, and the system has problems: no 2nd analog, low battery life, the very small "sweet spot" that will ruin the 3D effect at the slightest bit of horizontal movement, and (something that I've noticed recently) the raised border around the bottom screen is making marks on the top screen.
I'm calling the people buying the 3DS now @ $150 suckers because they're getting the system now for the cheap price, even though the system still has flaws and a redesign announcement seems imminent.