Hey has anyone on here purchased or is thinking of purchasing Sonnets Duet CPU upgrade to their MDD Power Macs? I am heavily interested in buying either the dual 1.6 or the dual 1.8, both with 512KB of L2. But I have not read a single review on one yet. I'm wondering about performance gains, esp. comparing a dual 1.25GHZ G4 with Sonnets upgrade and seeing what the gains are when you lose the MDDs L3.