rePOST

I don't know if this should be a guide or just a question asking how good it is, but anyway.

I use it primarily as a counterpick to roaming midlaners. I've never lost with it (only in normals though, still worth noting my norm mmr is around high plat, which is higher than my ranked mmr). It shines against melees (Zed, Talon) since you're never giving them the opportunity to roam. You don't die neither because if they aggro you, you're generally in your minions : you E them, reduces armor (which makes minions hit slightly harder), AA+Q. You won the trade. Heal with passive/pots, repeat when they aggro again. When lvl 6 comes, either they all-in you or roam : if they roam, you push their tower (and ping mia) ; if they all-in you, your ult makes you unkillable. W/F if necessary.

Summoners : TP and Flash.

Skill order : EQEWE, max REQW.

Masteries : Mainly Stormraider's, but others like Grasp (melee) Warlords (ranged) or Thunderlord's (why not) could work as well.

Runes

vs AD : 5 AD reds, 4 AS reds, 9 hp/lvl yellows, 6 flat cdr blues, 3 cdr/lvl blues, 3 armor quints

vs AP : 5 ad reds, 4 AS reds, 9 hp/lvl yellows, 6 mr/lvl blues, 3 cdr/lvl blues, 2 cd quints, 1 armor quint

This is what I run. You can use whatever setup you currently use, if you prefer it. 9 hybrid pen reds could also work.

Build : Ring + 2 pots, Corrupting Potion, Raptor Cloak/Negatron Cloak (depending on their damage) -> finish ZZ'rot. TF/IBG, then SV/Omen/Sunfire. (throw in boots somewhere)
The difference with Top Quasus is that (you're not top) you roam a lot more. E nearly one shots the wave, you can roam yourself much easier. The lane is also shorter, you won't get ganked as much as Top Quasus where you're asking to be camped.

While it all sounds perfect on paper (I mean, I have 100% w/r over 6-7 games, which is pretty good), it probably performs really bad against mages. The only one I faced was Twisted Fate, and he didn't really roam because he was always under tower. I'd have to test it out at least 20-30 games to confirm if it's good or not, by facing a larger champ pool.

Feedback appreciated.