Magnus - Solo Mid

I´m sorry but i disagree, you can switch boots when you reach the lategame but you need the Manaboots and the Bottle early and mid to spam your spells. With PT´s you are limited to "One-Shots" and can´t do a spellcombo like Shockwave, Skewer, Utli, Shockwave wich kills each enemy. If you are the Maindamagedealer of your team you should get Mask of Madness later to get the Attackspeed.
Give the build with the Manaboots a try and always remeber: Maybe you win your lane with PowerTreads, but with Manaboots it is much easier to dominate the line. The spamming of Shockwave garanties that your enemy cant move over the river.