Looks to me like XP8, earlier in the series, 79-80. Eight ply all american maple shells, very modern edges. The sizes appear to be 8x8, 8x10 Concert toms, 8x12, 9x13, 16x16FT, 14x22 BD. The wrap should wear well without splits.
Sound... you will love them. The concerts could be cut and fitted with the proper Rogers profile edges by someone who is adept at that sort of thing. Hardware is readily available on the used market.
"Not worth very much" is such a relative term. Yes, you can buy these for a very modest sum. However, "not worth very much" ends right there. These can stand up with any modern expensive drums and hold their own very well. Some people have issue with the memrilock tom arms and mounts, personally, I do not. These were the very best drums you could buy at that time (1980). They were also some of the most expensive drums on the market at that time.
I have three sets of XP8 drums and I am very pleased with them all.
So, you can spend 3500.00 for Brand X Custom Drums with a clown paintjob finish and in five years regret those moments of bad judgement when they have less value than you will spend on this Rogers set that is almost 35 years old.... or you can buy the Rogers and in five years of decent care, sell them for slightly more than you paid for them.