Fantastic little device that is a must-have if you ride tubeless, IMO. The mount does appear a bit flimsy at first glance, but I've ridden thousands of miles both on my road bike and on my gravel bike with these things and have never lost a plug or had any issue. (I suppose you could use some electrical tape to add a little extra security to the plug/mount if you wanted.) I've had to use the plug only twice in all those miles, which I think speaks to a good tubeless setup, a quality sealant, a good helping of sealant, and good tires. The times I did need to plug, I fixed the punctures straight away and was rolling quickly. I now ride with two plugs/mounts on both my bikes, attached to the bottle cages, so that I can be ready for punctures and otherwise just not have to think about flats. (P.S. I now race cyclocross almost completely on tubeless tires and keep a plug on my CX bike as well, just in case. So far, so good.) My only complaint is these suckers are sure expensive. But for me it's a little extravagance that gives me peace of mind.
I build vintage racing bikes and prefer tan wall tires for the period "look". These tires are at a terrific price point to help keep my projects within a budget, yet they are attractive and perform reasonably well. There are tires that are longer-lasting and provide better grip, but the overall value of these tires is hard to beat.
I've been riding Conti's for about 10 years now; clinchers with tubes. I got occasional flats but, and it may be luck, haven't had a flat now for almost 3 years and 7K miles. It may be that going to wider tires (I'm now on 30's) and lower tire pressures (now at 60 & 65) result in fewer flats? Conti's have a reputation for being hard to mount. This was true on my 21mm internal alloy wheels. But, I am able to mount the 30's on Vision carbon wheels using only my hands. So, it seems the right combination of wheel and tire make a difference. I got about 3K on size 25mm but am getting more than that since upsizing. They roll nicely on the Vision wheels with Silca TPU tubes; low rolling resistance and reliable combo.
The ENVE tubeless valve stem is designed with a rectangular foot allowing it to fit securely in the valley of the rim giving a secure seal and removing any chance for the valve stem failures of the conically shaped stems. Using an ENVE stem with a new tubeless tire will allow you to easily inflate and seat the tire with a floor pump. When I first ordered these stems, they got lost in the mail somehow, and I called Bikee Tires Direct and the resent the order right away. Thank you
