Cartridge rebuilds, whats your opinion?

I've recently won an Origin Live Resolution with Illustrious tonearm on e-bay. Needless to say I am thrilled with it. The seller had a Koetsu Red(Rosewood) fitted which clearly outclassed my Ortofon Kontrapunkt B, good as it is. So it should, it is twice as expensive. I'm tempted by the Koetsu, but the cost is difficult to justify on such a vulnerable item with a limited life span. I could consider it if a rebuild is a viable option. I know Koetsu will do it, but at a considerable cost. Here in the UK, a number of small outfits such as the cartridgeman offer competitive rebuild and retipping and I am sure a similar service is available in the US. Obviously the result will depend on whose doing it, but in general do you guys have any experience of non manufacturer rebuilds? If so, how close to the origonal can the rebuild get? It would be too much to ask to expect a 100%, but near would do. If it was a realistic prospect, I could justify it to myself(probably not the wife, but you can'nt have everything). Thanks, and greetings from across the pond