"I've been told to go buy a gun for a wedding present from my fiancé."
FIRST: Congrats on finding the perfect woman!
I have to echo the comments of most other members; the 15-22 is a great trainer, is reliable, and very addictive to shoot!
My first experience with the 15-22 was about 6 or 7 years ago. I was at a range and a buddy of mine showed up with it. I ended up shooting it the rest of the afternoon. After he refused my offer to buy it then and there, I ended up picking one up for myself.
This gun ALWAYS goes to the range with me, and ALWAYS gets shot. As for round count, i'm probably close to 10,000 rounds. The only draw back is that the ammo goes so fast. I can't say I've had any issues with it at all.
As for mods, the only thing I've I've done is add a el cheapo scope from BassPro, a basic web sling, and picked up a few extra mags..