I took my Zed 10FX today, since it has the monitor outs (but was tired and didn't mess with the Zoom). I was so amazed at the sound quality vs my Zed 6X. I think the preamps are more powerful. It is soooo clean. I just love the Zed and Blue 300.
Any Donny, to answer your question about pickup. There is very little bleed from the 300. I did not hear the small heater running in the studio, or anything else. The response is so overwhelming. You can work this mic so well. It cuts through the mix beautifully. It's very inspiring.
Off my soapbox
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Live: Korg PA4X/EV Everse 8s/Senn 935/K&M stand
Studio: Korg PA4X/Yamaha DGX670/Nord 6D73/Boss BR900CD/Tascam DP24SD/MTM Iloud/Sony C80/AGK 214/ATEM Mini Pro switcher/K&M stand