$15/hr isn't too bad I guess. I'm assuming there's no session fee. Pricing is on par with a ICE that gets ~27mpg on premium fuel for me. Chademo max I've seen is 44kw. 44kwh gets you ~130 rated miles (correct me if my estimates are off).
Yes, not too bad as an alternative to a full Mountain View SuperCharger: hopefully you're going south so you can use Gilroy SuperCharger, or east so you can get into Dublin, Manteca or Fremont SuperChargers, so you don't need the whole 130 rated miles. Alternatively, it could get you to a nearby destination charger or home in a pinch, often a better alternative than the other Chademo's out there which are further away from the highways (or pointlessly far from Mountain View SuperCharger to be of any help to you if your state of charge is already low). This could also be a quicker top-up to get to those places before rush hour crescendo's if Mountain View SC is full.
Finally, if you know you need a walkaround break to stay awake and keep the blood flowing, and only need a few dozen extra miles of range cushion, then you can just skip Mountain View SC during high use periods and go straight here, plug in, walk around, come back, and be on your way without a worry in the world; with no per-session fees and only $0.25/minute which for a ten minute walkaround would be about $2.50, it's cheaper than a coffee and in the afternoon or evening more healthy due to a more regular sleep schedule that night. Even 15 minutes at $3.75 isn't too bad.
However, unlike the San Mateo Supercharger and its co-located Chargepoint fast chargers, there are no services (stores and restaurants) at this site.
The 7-Elevent at Mountain View SuperCharger is nothing to rave about either. I can get my usual ice in a cup plus coffee, or a water, but that's about it, and if at the moment I don't need those things, then Mountain View SuperCharger is really boring. Considering what I said above about a walkaround charge, I'd love to skip that 7-Eleven and go straight to a NASA outfit.
Consider:
Homeless people & drug users at a 7-Eleven and maybe some movie goers, long wait, coffee
vs
Future of human kind organization near some Sunnyvale neighborhoods, a golf course, and a huge legendary airport, a nice walk, and on your way.
EDIT: Seems that it is closer to neighborhoods than I realized. Odd: Bing Maps doesn't find that address properly.