I bought a DynaPlug kit on an impulse buy at Cycle World because they were on sale. If I actually had a flat, I don't think I would try one and would just go with the tried and true sticky worms. I did do this DynaPlug test, on a tire before I changed it out. I think the big issue with the DynaPlug kit is reloading the tool.
Used a Dynaplug to fix three separate flats on the Concours now (1 kit for all with a set refill plugs).
- 1 time the day before last years bun cooler on a tire with 42 miles on it - plug lasted the 3000 mile trip and back plus 3K local stuff
- Year an a half ago 1 plug into a tire that went another 4K
- 2 weeks ago 1 hour into the CA Coast Campout put 2 plugs in 1 puncture - still going strong
I did use a little astringent between the 2 plugs/1hole when fixing the Campout flat to ease the reloading of the second plug into the handle.
All told, 15 minutes per flat to find, plug and Slime pump the tire back to proper pressure - all have held, and the kit is packed and ready for this years Bun Cooler trip.
YMMV