I made a big mistake many years ago buying a Prakticamat, I wish now I'd bought an Exacta Varex100. The earlier Exactas were far better than the RTL 100o and the CZJ lenses were optically superb, mechanically they could be awful, not stopping dwn consistently.
I see Exacta's for sale quite regularly at quite low prices, the RTL 1000 are the cheapest and least desirable, that's why I think the OP paid what they are really worth for 2 bodies and 2 lenses.
Having said that some of the best 35mm negatives I've ever printed were made with a Varex 1000 (VX 1000 in the US) and CZJ 35mm Flektagon, 50mm Pancolor and 135mm Sonnar.
Ian