I’ve done all sorts on my pro6. Raced and won CX races, done the three peaks, rode the coast to coast (mostly off road 150miles) in a day, done a couple of road centuries, ride with my local club after the cx season but before the summer bike comes out.
Fantastic bike, real all rounder. Would buy another without question tomorrow.
Having said all that. Cheap heavy steel is good for regular commuting. I ride a pompetamine, it takes a battering and is looking pretty tatty after 2 or 3 years. Might spruce it up with a powder coat. It functions absolutely fine though and I imagine it will just keep on going.