Sterling Pro Alt Reg C

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Does anyone on the forum have experience with one of these?
https://cdn.shopify.com/s/files/1/0658/7343/files/A2Bs.pdf?743
They seem to be an attractive alternative to the Balmar ARS+ ACR+ (mppt solar controller?)
Looks like it is a DC-DC converter with a smart charger and starter battery combining relay on the output.
The major downside I see is that if it fails you are SOL. Although it appears you can manually bypass it to go right back to alt charging if there is a problem.