Urban Arcana was a load of fun. I remember playing a psionic sniper back for d20 Modern back in my high school gaming club days. Far from perfect, but a load of good memories. I would probably pick Modern AGE nowadays if I wanted to play a game with a similar vibe.
I liked the system a lot but never ran it. I can definitely see using it as a go to system for certain genres. For example, I considered doing a modified version to run Gamma World and I think I'd rather use D20 modern for Cyberpunk than any game system built for such settings.