As for price-performance is the Ultimate Edition of Defiance very top. You get the contents of the Collector's Edition, plus the DLC Season Pass and 1,200 units of the cash shop currency - which almost the entire purchase price (for PC in each case) constitutes extrapolated. To this was the rather large and well designed Shoulder Bag, an art book, the game soundtrack and the Hellbug statue. And all still really impressive packed.
As for the game, so the opinions go there safely apart, but I like it and the gameplay is even after prolonged play is still fun.