I have one and quite enjoy using it but I must say I prefer my Rolly Tool but more from a 'feeling' perspective than any great difference in performance!
Do you have one or are just looking at mo (I could be pursuaded to sell mine as I say, I don't really need both!).
Re spares, I'm not sure. The cutter is double ended and just needs a wipe with a diamond card every now and then so can see me needing another one this lifetime!
Let me know if you have any Qs re mine or this / other holllowing tools as I have got or used the Exocet and Rolly as I say but also the woodcut, kelton, STEWART (Sorby) system, oland type, hunter tools plus couple of others!
BRgds
Simon
Simon