Comparable in that they can be compared. The Fafner was their flagship high-end bass head, built in Sweden, with a hybrid tube/solid state pre-amp and a class AB power stage. Reidmar is a simpler, smaller, lighter, class D based amp built in China (not a bad thing in itself but it tells you something about how it was designed). The Fafner cost a lot more to build and a lot more to buy new. The Fafner can handle 2 Ohm speaker stacks, while the Reidmars (apart from the little 502) do not. I don’t need another bass amp, but if I stumbled across a Fafner at that sort if price I would be tempted.