Im using Tubeless tires on my MTb since 2008, and overall no problems.. Just Once i got side cut, not possible to seal from the sealant, so i had to put inner tube to ride back home, and the cut i tried to fix on the trail inserting 1 USD.. It holded somehow until i got home.. Probably the same cut will happened if i rode tubes as well...
Another problem i had, i did not ride that bike for few months, forgot to rotate the tires, sealant was dried, and i can say the tires was destroyed.. And also hate the hussle to check if sealant is dried up or ok.. Once i thought there is enough sealant, and got puncture on the road (winter time 0 degrees outside). I just put spare tube and continued my riding.. I had good experience with STAN'S sealant, and not so good with Joe. Orange sealant could not find here, and the shipping will make it very expensive if i order just sealant. Oh another issue with tubeless sealant.. Probably amonia corroted the rim, and the valve hole was much bigger then it should, so that rim dont work anymore for tubeless setup (Mavic X817 rim).
But overall, for MTB use i'll continue using even there is some negative things..
For road.. Based on good experience i had in MTB ing, first wanted to buy Shamal 2Way Fit version and to use Tubeless as well.. But at the end i picked regular version and could not be happier, and dont bother anymore tubeless and road...
Why? I'll answer based on my opinion then (three years ago, when i was bying the Shamal wheelset):
- 2WayFit version was a bit heavier then Regular version
- I read it that in the case of need to put inner tube, it's almost impossible on the road, even using levers (i imagined situation of beeing 100 km far from home, on -5C and how i try to put spare tube which will get me back home..)
- Not so much choice for proper Tubeless tires. If i have to use just few tires models, and dont have freedom to choose from more models.. Not interested.. For MTB there is a lot of choose.. Hope this is changing now for road, didn't check how is it in 2017
- The mess of sealant sometimes
And based on my experience in last three years since i bought Shamal's could not understund why at all would like to upgrade to tubeless:
- Im using Latex inner tubes, so the ride is very comfortable and supple..
- I was using four type of tires in this period:
1. Continental Attack/Force - On three pairs after 1500 km rear tire sidewall was damaged, but just replaced the inner tube in 2 min, and continued riding home. Then binned that tire
2. Vittoria Corsa G+ Clincher - Never ever had a puncture (more then 3000 km, and i got bored of them, so i just switched them to ride some other tires..They are still usefull)
3. Continental 4000 SII 23mm - Never ever had a puncture, more then 2500 km on them. Probably will ride them until 5000 km without a puncture.. But will see
4. Continental GrandPrix 4 Season - Never ever had a puncture. A lot of riding on them
Another thing why i dont like tubeless is that is not that easy to switch to other tires if u need for specific riding condition (as everyday setup) . With non tubeless setup i just switch to something that i think is needed in few minutes. I must admit i had problems destroying Latex inner tubes two times while i was installing them (i was in hurry). But after using talcum no problems at all, and trying to dont hurry up..So never problems after i switched my habit.
Another wheelset i have is Bora One 35 Tubular and until now i used only with Vittoria Corsa G+ tires.. Also not easy and fast to switch to specific tires if i needed, but those are not my everyday wheelset. If i have to pick between non everyday wheelset on road: Tubeless vs Tubular, everytime tubular for me..So that why i was comparing them only with Clinchers..
Also there was local guys who was riding tubeless wheelset and they were very satisfied.. But strange, in last year all of them switched to two pair of wheelset at the end: Clincher with inner tubes + Tubulars (or just Clinchers with inner tubes). I dont know anyone riding tubeless anymore here...
This is just my opinion, if someone have nice experience with tubeless, and is ok for their riding condition, then that's the right choice.. Every choice that make u ride more and reliable for specific area/condition or him self is proper choice of course..