I've never heard of your cartridge and have no idea of its value but FWIW a mate of mine has just had his Goldring Elite or Excel, I can't remember, retipped by Soundsmith in the States and a new "ruby" cantilever - all for 150 euros , I think he said. He says it sounds great and service was good.
The performance is far from run of the mill IMO.
AT are a huge company compared to those making many of the exotic and highly priced designs on the market. Economies of scale, automation and tooling that has long since paid for itself mean these cartridges are as good as anything if you want accuracy - if you want something that is effectively a tone of effects device their are some pricey models around that will perform that function.
I had an OC9 MLII and got it for £160. A huge upgrade from my G1042. THEN I got a Troika and although it was tired it was better in every way than the OC9 other than tracking ability. I sent the Troika to ESC and the Paratrace tip revitalised the cart and gave it 90% of the OC9 tracking ability.
ESC know their stuff!