I bought the new leaf xl, as an upgrade from my Zelda 3DS and I've been enjoying it.
There isn't anything I miss about the original 3DS, I like that the 3D slider stays off and clicks to off so it stays there. The 3D is superior and seems to be easier on my eyes.
And as a guy with big hands they don't start to cramp up as much when I hold the 3DS XL, it can get uncomfortable if I've been marathoning animal crossing. But no where near as bad as with the original 3DS, and cramps happen after far more time if they happen at all.
I don't really feel like I'm more than competent, but at the same time I feel like for the most part I do well online, usually at or towards the top. Though I imagine it's built to feel that way, if I felt like I always lost I probably wouldn't play, and I probably remember victories better than losses.
I guess I have no clue, but I highly doubt I could be a pro.