jamesdak 

Yep, I pretty much carry a Zefal HPx on every ride no matter which bike I take. Only have a few I can't fit one on. That said, to be honest I also carry a CO2 setup with me also with and extra cartridge. Plenty of room in my saddle bag for that , two spares, two tire levers, etc.

I usually flat only once or twice a year and the last couple of times it's been super quick and easy getting back on the road using the CO2. But I will always carry a Zefal as a dependable backup.

I recently picked up another one so they are still around. Sometimes hard to find the size you need to fit your bike though. Remember to take that into consideration.