I would rather advise for a Xbox 360 or Xbox One instead.
The thing with controllers is that except being laid back, you get "advantages" in certain genres. Racing games, platformers, brawlers/fighting games, and maybe some others.
Meanwhile controllers up until the Steam Controller were doing pretty badly for shooters and strategy games. While it's true fps on consoles is a thing, it's less skill and more aim assist.
The Steam Controller was made to try and do better at those, hence Civilization 5 was one of it's selling points in the videos... However the finished product is something that tires to be too much of everything. It's effectively a controller that does not do shooters and strategy games better than Kb&M, and the other games better than any other controller. It's the equivalent of playing those games with a laptop touchpad, and everytime I did that I was thinking "Damn I wish I had a mouse". The d-pad is sad for anyone that likes to play platformers & fighting games. Racing games are okay since you still got one brown townog stick but otherwise it's pretty uncomfortable since you don't have the best access to the horizontal axis depending on how you hold the thing.
Unless you absolutely only play shooters and strategy games (in which case the only other option is more expensive - wireless kb&m with a hard surface to keep them on ala Logitech Couchmaster, although something homemade is also possible) you really should get a Xbox 360 instead.
Regarding casually browsing due to the touchpad I think if you have a PC in front of you, you'll end up throwing the controller away to stick back to kb&m anyway. That's not why you should buy a controller.
