Chop Shops and Weapon Depots - Spending RP to buy down timer

I'm still trying to wrap my head around whether or not this is a better use of RP than buying skill points. I have plenty of components, so that's not really an issue. 12 RP for 6 stamina is not bad, and it gets even better if you are buying down less time. Of course your timer resets as well, so you kind of have to factor if you are going to be on to redeem when the new timer is ready... I guess that's what's throwing a monkey wrench into my evaluation of the whole thing.

So, what are your thoughts? When and where are you going to spend your RP?  At the moment, I think I am just going to hold on to them and see if Zynga makes further changes when the animal pens and armor shops come out.