Thiel speaker service

Am wanting to hear more about Thiel drivers failures. I know the 1st order x-overs allow signal content into the non-linear behavior zone(s) of some drivers.  I don't much about peak excursion limits of various cones Jim Thiel chose to employ.  Don't know much about Thiel co-ax driver designs, or what "totally messed up CS3.7" might entail.

My purpose in asking?  I've always wanted to own a pair (e.g., CS3.6, CS2.3...) and want to know more about what may lie ahead if a fatigue failure eventually occurs.

^ As I understand it most Thiel driver failures are the result of underpowered / overdriven use. Being mindful of Thiel's minimum impedance and the amp's ability to truly handle it, and you should be OK. Even with the 1st order cross-over overlaps, most Thiel drivers are quite robust, and can handle quite a bit of power. 

The CS 3.5's mid-range replacements are a difficult find.

  I don't disagree.  Yet in 2+ decades I've never tripped the APOC circuit, smoked a tweeter, or overdisplaced a cone/coil of a cone driver on my B&W 801-II's.  Bi-amped (200+ watts on woofer, 120+ watts on mid/high), sometimes played to thundering levels in my 24 by 12 room (with two openings to similarly sized spaces), the B&W's play on and on and on like the Energizer Bunny.  Nor have I read of owner's having driver failures on 801's or other power hungry B&W's. 

  If I ever find an unmolested pair of CS2.3's or similar, maybe they won't ever replace my 801-II's.  Instead they'll be carefully used for "Sunday drives" like a finicky troubleprone old Fiat 124 Spyder, as they can't be relied upon to take me anywhere at any time?  If one's primary speakers fail, one is metaphorically speaking left on the side of the road. 

  My 801-II's powered as they are behave like an older Toyota Corolla.  Take care of it then drive it anywhere anytime perpetually. 

  I've heard of 801 owners rotating the woofer 180 degrees to offset any accumulated cone sag mitigating its impact on coil alignment.  I've never heard of Thiel owners doing any such maintenance to their cones.

  In summary, I agree any impedence challenged power hungry beast can be misused then damaged.  Parts are a huge issue that must lower resale value of some otherwise highly valued Thiel speakers.   

As I understand it Coherent Source has a lot of spare parts in stock, and repair kits as well. Upgrades are also on the horizon. Though not deficient or delicate, Thiel’s wouldn’t be my first choice if high play back volumes were the top priority. Rotating drivers is not unheard of with other brands, and some Thiel users have done so.