yup, i've got the tascam 424 and i dig it. i'm going to get some mic-pre's for it though, because it doesn't have phantom power, and i'm more in love with the USB capabilities connecting to the laptop than i am with the pre-amp capabilities.
i got mine after i heard the sound that fellow homerec'r Chris Shaeffer was getting from his.
on the day job i'm a software architect, and i've been doing some white-paper reading on the USB 2.0 architecture that INTEL has developed. my only hope is that Tascam/Frontier Design will have a way to upgrade the 428 to USB2.0
with the new architecture USB will be just as fast as firewire. the issue is really a matter of support. since USB is INTEL brains and most PCs run on INTEL you are in pretty good shape.
I still think IEEE394 (firewire) is a better architecture, but that's not the point.