Some really good points being made here.
I use a Linhof M679cs with a Phase One P65+. The way I look at is that large format digital is still a work in progress. Bit by bit the gaps are being filled (for example look at the improvements in lenses over the past five or so years), but there's still a way to go before the basics are acceptably well sorted out.
The core problem that I still experience is focusing, especially when employing movements.
Ground glass on 4"x5" cameras with a x4 or x5 loupe worked adequately well. But we've still got what are essentially the same ground glass screens, except now we really need x12 or x15 loupes. But go much above about x7 and all you see the grain of the glass.
Live view could change all that. But currently it's not available. Certainly I don't consider the IQ 180 as delivering useable live view, if it did I'd have upgraded. I'm not an engineer, but as I understand we won't get true live view until there are medium format CMOS sensors. I hear regular comments from Phase One dealers and staff that strongly suggest CMOS is in active development, I'm sure the big sites like this have better information, but I'm equally sure non disclosure agreements prevent any comments.
The next problem is the stability and precision of the cameras.
I don't want to get into a debate about brands, but the way I look at it is this, if a Linhof M679cs isn't quite rigid/precise enough for digital (and it isn't) then no similarly designed camera is likely to be up to the job either. The Alpa style design offers more precision, but at the price of movement restrictions and additional focusing inconveniences.
Once live view's available then perhaps LF digital can start to come of age, with cameras moving more in the direction of Alpa style designs, discarding sliding backs or the requirement to mount and unmount backs, and composition and focusing being chiefly achieved via live view.
Until then LF digital remains a compromised work in progress. I'm still using it, and still enjoying my photography, but I honestly think we've a way to go yet.