I use the HVR-MRC1 with other Sony cams, I don’t bother with tape unless I’m using a small cam like Sony’s HCx or Canon HVxx, I currently archive to Harddisk and bluray data data disk. I use 32gig compact flash cards with the recording unit, you can get over 140min per card, the cards are formated Fat32 but the included Sony software(PC) with download and stitch the file segments together, with a normal card reader you can download a 32gig card in about 30mins, there are faster card readers but can be expensive, but its only a 1/4 of what it takes to do a tape.
I’ve used the Z5 and Z7 on shoots but decided not to buy for myself as the MRC1 works with a FX1/Z1 either dual record or CF only and Sony is coming out with other tapeless cams like the NX and AX