Increased health, strength, decreased risk of significant and painful diseases (e.g. if they could technologically/genetically reduce a risk of cancer or heart attacks I'd go for that). I wouldn't be especially interested in technologically replacing or modifying limbs or other body parts. The uses might be great, but I expect the process would be painful and the feeling of incompleteness in the body might lead to unanticipated psychological problems.
Though, if it were possible to get something like a HUD in my glasses (map, compass, basic info on things I was looking at in a way that wasn't intrusive to normal vision) I would be all over that.
And now, have some ponies
Spoiler