Stans is hard to beat. I've usd it to convert regular rims and tires to tubeless with their kit and also with their (Stans) flow rims and tubeless ready tires. It works as advertised, seals punctures super well. In my experience you can set it up once and be good for a full season no problem, but every spring you'll want/need to re-do it for sure. This is an incredibly small amount of work considering how much less time you'll spend on the side of the trail replacing tubes! If you're thinking of converting to tubeless I say go for it, in my opinion it is one of the best bang for your buck improvements that you can make on a mountain bike.