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Went to £630 on auction last week with winning bidder apparently mucking about. Weighing up unknown repair jobs is hard. I would think that if someone's gone to the effort to have frame repaired and paint job done nicely (looks like they've chosen black to match other sections of black paint as the original red may be hard to match well), i would reason a decent job. Definitely a risk. Only other thing I'd check would be serial number.
Just seen one ride past. Lol
This seems a bit cheap at £550 for a Factor One https://www.ebay.co.uk/itm/126062532230
Seller is well rated, but repainted seatstays rings alarm bells.