It was my last Gameboy, and was mind blowing awesome after skipping the original version, so going straight to it from the GBColour.
I used it for a good few years, since I didn't make the jump to the DS until the second year of the DS Lite being out, getting it in a deep sale with an extra employee discount through my sister.
I always feel the Advance's library is a bit over rated, as the real bangers are absolutely dwarfed by both the Gameboy before it and DS after, but games like the above FF Tactics Advanced, Metroid Fusion and Minish Cap are phenomenal titles that kept me entertained for months and are just as good today as they were then.
Sadly I gave my SP to my nephew, after I got a DS Lite, who, I learnt recently, binned it a couple of years back. I blame youthful short-sightedness, as I'd love to have a crack at modding one with a better screen and some of the cool customisations I've seen are available for it today.