My Fazer 600 got written off and the insurance company loaned me an SV650s for a few weeks. Going from a 4-cyl to a twin was great fun as the Sook has brilliant pick-up and grunt from the off. I learned on a CBF500 and while the SV shares characteristics with the Honda twin, it's more grunty and revs better too. Brakes, chassis, all of this is great, and the bike looks good too. However, I'm less impressed with the build quality and finish than my old Yamaha Fazer. Also, the ride position, while making for a supremely chuckable bike, but it didn't make me feel comfortable cornering as I'm not at that level as a rider yet. The hunkered-down riding position also made my wrists quite sore on long journeys, though the wind protection is great at 80mph+.
I had a problem with the SV650s and they swapped it for a naked version. Wow! That was a revelation. I suddenly found that town riding was miles easier - I could see ahead easily and cornering was much more confidence-inspiring. The naked version is much easier to thread around town and the torque of the twin makes it a brilliant commuter. Shame about the loss of the fairing.
All in all it was a great bike to build experience on. Forgiving, fun, light, good sound and look, with way more ability than I could exploit. However, the build quality and lack of centre stand are big flaws for me. If you garage your bike and don't ride in the winter you should be okay. Me; I got an FZ6 Fazer - centre stand, fairing, comfy riding position and good build quality.