That's great. I wish it would of been an option for my HCH. I drove who knows how far on a very low tire once. I went into a store for 20 minutes and when I came out it was flat, I didn't even notice it flat as it was on the opposite side of the car - noticed it when I backed out of the spot.
The one time when I didn't do a walkaround of the car before entering (old habit).
I think the mustard color is a good idea. Encourages people to get the full size tire back on the car quicker.