Well from my own point of view, I had it in my head from the start I was going to get revo, but I think I only paid £270 ish for the bluefin, so seemed a good deal, as I couldnt afford the extra £500 for Revo this year!!!!!!!!!
If you arent planning on getting anything apart from stage 1, maybe stage 2, then save your money and stay with the bluefin, otherwise, sell the bluefin, make £60, and put it towards revo
From what I've read, no-one has complained about revo, but have done with bluefin.
It does make a big difference with just the bluefin, I'm sure you'll be happy with it.
On the other hand, if you go through JKM rolling road results on their website, some revo dont do very well on their dyno, and come out with less than the bluefins....................
Choice is yours at the end of the day, but I think it worked out pricewise the same for me getting the bluefin and going to inters next year, as it would have driving 10 miles down the road and getting revo at my local dealer so I was told.