I've been playing Vi quite a bit and have been loving it. I've got a pretty good idea of how to build her, but was curious as to what others have been using. My typical build has been:
Machete+5 pots -> Madred's -> Boots of Speed -> Vamp Scepter -> Brutalizer -> Boots of Swiftness -> BT -> BC -> Then build based on the situation from there, choosing between Warmog's, Zephyr, RH, IBG, LW, etc. I really haven't tried BotRK, but probably should. I honestly don't know much about it, and it's being changed soon. Tips on that would be appreciated.
As far as skilling, I max Q then E. It helps to max E for the lower cool down and faster clear, but I don't think it's as beneficial as having the lower CD on Q for ganking, chasing down kills, or dashing over walls. During a gank, I usually only get E off twice before they escape or die anyway.
Too much damage and not enough tankiness early on. Vi is so scary because she can do so much damage with purely a Brut.
Your Vamp scepter is also pretty useless for a while I think. You don't really do that much autoing to justify it.
So take out the Vamp. Move Warmogs up into your core build, and somewhere early/mid as well. Then you can start thinking situationally and decide if you want BC/BT for more damage, or more tankiness so you can initiate and dive more reliably for your team. --- http://i.imgur.com/ZhLrT.jpg http://i.imgur.com/H6Frl.jpg
I prefer Wriggle's on her still rather than the newer Jungle items. :x But I do stick with the usual Brut -> 'Mog's followup. --- http://img.photobucket.com/albums/v202/Lovnaru/Photos/moxsign.jpg http://myanimelist.net/profile/AvalonBright
My build is so glass cannon because I typically have to carry games. When I play with friends or in ranked I build much more tanky. Building so offensive also helps me to gank and shut down any threats early. --- Currently playing: games