Denise's... to buy or not to buy?

I have come to the conclusion of late that I need more needles. Well, circular needles anyhow as I have piles of the regular sort. The question is, can I justify buying a complete set of Denises? At £30 a pop it's a big investment. I can see the benefit of being able to lengthen and shorten your cable but I'm not sure that I will actually make use of all of the sizes in it. Also they don't actually go down small enough to knit socks on (I do like my DPN's anyhow and have just received a teeny weeny pair from AY anyhow). Hmm, I shall have to have a think about it some more and in the meantime hope that the cable doesn't actually finally snap on the one that I'm currently using.