I've never tried the Rene Herse endurance casing. My reasoning is that it defeats the purpose of these high zoot tires in the first place, which is a high volume tire that is comfortable and has extremely low rolling resistance. Well that and money, being a family man these days, there's only so many high dollar bike bits that can be justified.
I ride brevets sometimes and for that purpose, the Rene Herse tires are 100% worth it, it's just that much more enjoyable to ride distance with them. I only use the standard casings and they are a good balance for me of weight and flat resistance. I see others riding the ultralights but I can't justify the extra cost. I've tried cheaper ultralight 650B tires like the Pari-Motos but they are just too thin to ride with tubes, I had 6 flats one time on a 600K with the Pari Motos and had I had another flat, I would have been hitchhiking back to the hotel.
I cut my teeth riding brevets on 700x28 Gatorskins in my mid-30s, if I had to do that now, I probably would stop riding brevets.
But anyway back to the Clem tire question....
Literally the Clem has been the most cost effective bike I've ever owned as an adult from a replacement parts standpoint, and that includes bikes I bought off the Interwebs for relative peanuts. I've probably got 3 or 4 thousand miles on it, riding distances from 2 to 72 miles. The bike has stock everything and until last week it had both the original tubes in it. It still has the original chain, cassette and chainrings, and everything else for that matter. I do lube and clean the chain pretty regularly and put oil other places where oil goes, and adjust the cables and derailers and so forth. The chain still has not reached the wear mark on my Park Tool, but when it does, I'll replace it. Otherwise, Clem just goes. I don't even put air in the tires that much. Maybe once a month, which is saying something because it's my tool of choice for my before work or lunchtime rides around the neighborhood.
I did give Clem some King Cage Iris water bottle cages that I had sitting around in my parts bin already and a Brooks saddlebag that I got cheap from a LBS, but I would have done that for any bike that I acquired.
I even balked at the Brooks saddlebag at $70, but the shop owner happened to be there that day and he offered it to me for $29, which I immediately accepted. He knows I'm a good customer and the first stop for any problem I can't solve on my own, or if I just don't have time to solve it with my busy family schedule.
Putting Antelope Hill TC Endurance that cost $184 a pair on the bike doesn't exactly fit that ethos. If Jan wants to mail me a pair of them for free, I will be happy to write a lengthy review after several hundred miles of abuse. Otherwise I'm going to keep riding the KwickNines.