It's worth it Rob. My favourites just now are my chain whip and cassette removal tool. Pretty basic stuff but for some reason I like using them. I managed without a chain whip for ages and used an old singlespeed chain that I kind of wrapped round my foot. I got bored of sore feet so splashed out a tenner. The Shimano cassette tool is great as sell as it has the big long pin down the middle to go into the axle and fits a 1/4" drive ratchet from my socket set. Lovely stuff.