I see Roy's (zRoyZ) chimed in, so here's where the first USD coversion he did on his VTEC ended up when he sold the bike:
Here's the spec sheet for the original VFR1 http://www.vfrdiscus...pic/38679-vfr1/
Pretty much the whole thing went in as is, though there was some fiddling with moving oil cooler, shaving the inner fairing, moving cables, pipes etc
Is it worth it? Let's face it any improvement on the stock suspension and brakes has to be worth every cent - both are critical in keeping you out of trouble and as anyone with any sense will tell you, the only two things the last and best 750s need are decent brakes and suspension. The F4i swap - adjustable suspension, much better brakes - is one of the easier and cheaper options, uses Honda parts (so no faffing about with different axle specs, disc spacing, wheels, wheel bearing sizes) and will make a helluva difference.
Is it worth spending so much on a USD set up on a bike this old? In my view the question answers itself - the people who do this sort of thing aren't about to sell their bike so resale figures are irrelevant. In the end it comes down to turning a great bike into a fantastic one. As I said to Roy when I first rode mine with the R1 front, it feels like I've suddenly got 2-3 seconds extra per corner - the $$$ spent automatically justifies itself. The brakes are brilliant, but the irony is that cos the handling is so good I use them less than I did on the OEM set up. It steers much quicker yet is utterly stable (no hands-off headshakes at any speed) and it doesn't chew front tyres anywhere near as much. It will keep up with any modern sports bike in the twisties - or would if I wasn't such a pi$$-poor rider.
And it looks mint