I have an ARC SP11 MkII and a VS110. Neither of them are going anywhere.
ARC's reputation for quality and durability rather speaks for itself. There aren't many brands that are so sought after on the aftermarket... And should the worst happen, and ARC sinks, their gear is serviceable by competent techs. Schematics are easily available on-line.
"Don't panic." - Douglas Adams
Happy listening.