JC,

I have the 450v2s. I LOVE the sound and 40 lb weight. I like the design that allows for different configurations on the floor. I've also mounted them a couple times. IMO, much better than PD, L1 and Stagepas, which I have also owned and played live with.
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Live: Korg PA4X/EV Everse 8s/Senn 935/K&M stand

Studio: Korg PA4X/Yamaha DGX670/Boss BR900CD/Tascam DP24SD/MTM Iloud/Sony C80/AGK 214/K&M stand