i have a Revo, a Starky and i am lucky enough to have a Cuetec shaft as well. personally i like the Cuetec best followed by the Revo and lastly the Starky.
i like the Cuetec best because it has a taper similar to a 14" pro taper and it has a white ferrule and a softer hit which i love. the Revo has the least amount of deflection of the three ( to me ) but not by much which is good but it has a straighter taper that i don't care for and the no ferrule thing is hard for me because i'm older and don't see all that well any more but all in all i do like the way it plays. the Starky shaft, well i don't care for and i will leave that at that. just my two cents to the question and i am by no means an expert.
Finally I had possibility to test cf shaft. It was my first experience to shoot with one and I have a lot to say about it because it was so useful and important experience for me, the one which divides your view in : before and after. I will share with more of my thoughts about it another day in the appropriate thread.
So it was Revo 12.9 shaft which I had possibility to try. If to be short I can just say I had so much fun playing and trying different shots especially those I do struggle with usually. I must say that shaft deserves its name. After my 20 years experience in this sport it was let's say like this "the most easy and fun to play with" shaft. Immedeately after the first shot it was obvious energy transfer is on another level and I have a shaft built on my own which I like a lot and which is also powerful but I have a very simple conclusion the loss of energy in a Revo shaft is much less than in any wooden shaft on this planet or I may just not experienced that one yet).
When it comes to the advantages of a Cuetec shaft you mentioned if the longer and slimmer taper, the ferrule and softer hit are your main concern why just not to play with a great wooden shaft for much less cost? I don't even need to try this shaft to say it is obviously behind Revo when it comes to energy transfer. For me it plays closer to the wooden shaft and it is enough some watching to see the difference and I have possibility to hear the opinion of some players. In my opinion the main mistake Cuetec are making...they try to make a big step in front and get from a division where they offered fairly cheap cues to another division...long story short with such a high price for the cf. shaft if consider 500$ for a Revo or 450$ for a Cuetec especially after trying the first one and being sure the second one does not offer what I'm looking for if I ever think about paying that value for a shaft I would definitely add 50$ more to get what I like.
Closer to the theme of this tread I believe new series of Becue shafts may have those properties I liked in Revo. Very soon we'll see the review of Marek in his thread and find out