I ordered a Rebel Yell from Tim for my Flying V90 which I wrote about in the guitar and gear part of the forum.
The construction of the guitar is 25.5" scale length, ebony finger board, maple neck, light mahogany body, single volume control. Based on this I would say the guitar is quite bright for a Flying V - though it retains the characteristic bark.
Except for the lifelessness and bad clean tone I quite liked the pickup which was installed - a Gibson/Bill Lawrence designed symetrically wound A5 14k pickup. Tim suggested a Rebel Yell would be closish to this design, and hes recommended me Rebel Yells for Vs in the past. In addition I felt the look of the guitar suited the spirit of the song Rebel Yell. Furthermore, I tried a Rebel Yell loaded PRS of Phils which I liked the sound of.
Unquestionably the pickup works in my V90, and furthermore I would suggest it would more than likely work in all but the darkest and muddiest of Vs.
The most notable aspect of the pickup is its strong upper-mid prescence, and I would think it cuts through a busy studio mix or electronic-heavy band like butter.
The low end response is not particularly strong, and it remains very controlled, even with my 2204 Marshall. This is exactly how I like my bass response :)
High end is quite extended, in the V90 I reached for the tone control which wasn't there ;) So I rolled a bit of treble off on the amp. Perhaps a 350k pot would fix this.
Generally I found the tone to be in the vintage hot ballpark. The Rebel Yell is an excellent choice for V owners wanting something vintage hot. In a way it sounds a bit like an A5 Mule at times, but the bass is much more controlled in the Rebel Yell, despite being a bit thicker sounding and of course more compressed. Pinch harmonics on this guitar are the easiest to find in any instrument I've even played.
Unlike the standard pickup it cleans up well, the tone is very nice and very usable, its quite soulful though I wouldn't pick this guitar first for a bluesy tone.
So it works well, and gives a tone which would be great and entirely usable in a band or studio situation. Am I satisfied? Not entirely... To suit my perception of the guitar it would be nice to roll some of that top end off, and have some more lower or mid mids. The top end is surely as aspect of this relatively bright V. I'm considering putting the Rebel Yell in my Feline and trying a VH2 or Holy Diver in the V90.
The pickup doesn't sound 80s in the way I was expecting, though I'll probably keep the Rebel Yell in it for a while and use it for my electronic music where it will give great perfromance and the best cut of any of my humbucker guitars.