They've done this for years now (sell 360 tickets)
They use an open stage setup - no frills.
They do a decent job of acknowledging the fans in the back & I've seen them play a song or two turned to the back.
You'll be able to see fine - BUT you will spend the majority of the show looking @ Matt Cameron's back.
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Sets so far have been VERY nice:
Toronto Ontario Air Canada Centre 5/10 Set 1 Release, World Wide Suicide, Life Wasted, Severed Hand, Hail Hail, Unemployable, Dissident, Even Flow, Corduroy, I Am Mine, Low Light, Whipping , You Are, I Got Id/(Cinnamon Girl), Better Man, Jeremy, Marker In The Sand, Black, Rearviewmirror
Encore 1 Wasted Reprise, Man Of The Hour, Elderly Woman Behind The Counter In A Small Town, State Of Love And Trust, Do The Evolution, Alive
Encore 2 Go, Crazy Mary, Fuckin' Up, Indifference, Yellow Ledbetter
Toronto Ontario Air Canada Centre 5/9 Set 1 Severed Hand, World Wide Suicide, Life Wasted, Marker In The Sand, Given To Fly, Better Man, Even Flow, Unemployable, Garden, Sad, Corduroy, Present Tense, Daughter, Grievance, Not For You, Inside Job, Why Go
Encore 1 Do The Evolution, Jeremy, Come Back, Alive
Encore 2 Porch, Rockin' In The Free World, Yellow Ledbetter
You can check them all here:
http://www.pearljam.com/tour/