The company that I recently worked for (now closed) Invested in IB Systems products and equiptment in 2001. This has been a primary flat product over torchdown since.
The installation is about the same as torchdown on small projects where a hand welder is used, the trick is to apply the right amount of heat/time per foot to get a good weld.
On larger projects where a robot welder is used, the installation speed is faster.
+..+..+.. No cant strip req., and is durable under ponding water (so long as you get a proper weld), various clad metal and additional accesory designs to choose from (no primer needed.>>>
I have no experience with IB. Their percentage of marketshare is small enough that it get's lumped in with the "other" category in the pie charts I've seen.
Sarnafil is the biggest pvc in the US, and a very good product. I install fair bit of it.
Fibertite is my PVC of choice. Never seen one fail in 27 years of putting it down.>>>