the shifting problems are all adjustment issues, but as a basemodel 'hopper owner, yeah, it's all just as upgradeable as anything else. I don't remember what the naked frame weighs, but you can change out pretty much everything around said frame... and 'Hoppers are pretty sturdy little bikes. Mine is mostly stock yet, but you could lighten her up significantly by getting better rims/wheels, handlebars, maybe seatpost/seat, cranks, tires, etc... Deore came on my model ('03) and it's served me pretty well... and it's still relatively pricey.