I also still have one of those. CPU is the bottleneck, although upgrading to 2GB RAM is a no-brainer IMHO (more isn't supported if I remember correctly). SSD upgrade barely does anything, except if the old HDD is crapping out anyway.

I run bunsenlabs on it. Works well. I watch YouTube on it for workouts. Doing that in Firefox is an experience, but with feetube it runs alright (480p).