I use the AW4416. It sounds good. I've been using it for a couple of years with no external preamp and it does good. You have 4 position full prametric sp? eq, and fully adjustable compression on 8 different inputs. And you have two effects cards with all sorts of effects that can be used on the input source. (can also use them on the output) I'm looking at an avalon or something for an external preamp, just because it's Christmas time you know. I have a studio projects C-1, a couple of SM81's, 57's, shure beta kick mic, and an ADK 51s that I use into it.
AW4416 was a pretty substantial learning curve for me. But once you understand it.... the machine is layed out pretty good and it is really, really flexible.
Auto faders and you can store automixes..... fader levels and adjustments for effects and outputs, eq, panning etc for the stero output track. That part I couldn't live without. 8 virtual tracks behind 16 output channels is pretty nice.
Went through about 4 software upgrades. Yamaha mailed me disks as they became available. Very painless.
This machine is not the weak link in my sound. In fact it does much more than I need it to do right now.
Here are my two negatives. It only has phantom power on two of the 8 input channels. And you can't patch in a full size monitor. You're stuck with the one on the machine... (not that it's bad though).
Anything else you want to know?