Re: Looking for a workhorse blues/rock Strat
If that's what you're looking for in a Strat, then go for it. It obviously worked well for the owner since you can see he played the hell out of it. One thing I would definitely look into on that guitar is fret wear.
Upgrades for a strat are like changing brands of toilet paper. They're all minute upgrades. You can build up another guard and swap them out in minutes. Giving you a completely different sounding guitar. Stuff like tuners and saddles are preference. I prefer bent steel saddles and Klusons on a Strat, but that's not to say the locking tuners and graphtech saddles don't work well on Strats either.
So if it's what you want and the price is right, snag it up. It's not like there aren't several companies out there make Strat replacement stuff to change EVERYTHING at your very whim. Strats are generic, but cool like that.