I have four interfaces.
1. M Audio Fast Track USB. 2 tracks in, usually 1 mic and 1 instrument. Two tracks out in stereo. Very good for quick productions or for a notepad type device. Not bad for full mixes and songs though. This is actually a respectable interface, and even more so with the addition of believe it or not the 30 dollar Behringer Tube Preamp. I could use it for most anything except a project that was meant to compete with the big buck boys.
2. Presonus VLS44. 4 inputs can go on 4 seperate tracks and be mixed. Then out in stereo. The preamps in this unit are superb and the ability touse the VLS feature to record with effects on the inputs without the cost of latency. Presonus does this with the VLS feature in the mixer. The effects do not go on the recording but give you something real nice to build your confidence with when you are recording vocal or guitar. Also has the "Fat" channel effect for incredible vocal monitor sounds. This is a first rate device.
3 Tascam US1800 can input, if I remember correctly, 14 tracks at one time. Each can go to it's own track for mixing. There is a stereo track output but then there are also 4 separate line out output streams that can be most whatever you are wishing for. Also there is input for spdif stereo stream, which adds more. Then midi in and out. So you have 10 inputs with preamps onboard, then 4 more line level inputs, and the stereo pair from SP/dif gives you 16 consecutive ins. The stereo pair of outs, added to the four additional line outs, gives you 6 outs. None of this includes the Midi. Each track has it's own recording track. You can mix them down to a stereo track for output or you can use the stereo pair with the other four channels running whatever instruments or mixes you set them up as. This is very close to a first rate input, though slightly beaten out by the Presonus and probably by Focusrites also though I have not heard them yet. The input amps of either are just too good. I have a Studio Products B1 Tube Mic Preamp which I also use when really wanting to give it all. It does some sweet things as well, especially when in front of the Presonus or even the Tascam with the Tube pre handling most of the gain and the interface handling a little.
4. Also have a Zoom R24, which can give you eight mic or instrument tracks in simultaneously, when used as an audio input. It outputs to a standard stereo output tracks as do the Presonus and the M Audio. It also can be used as a sampler along with being a true 24 track digital recorder. It is not in the same class ampwise or sound quality wise as the Presonus or the Tascam. About even with the M Audio. It is a very decent sounding tool, though if I had the $500 to spend again it would probably be on a Focusrite, just to have one. I have all the guitars of the top brands and sounds that I need and then some. Same with keyboards, and computers for that matter. So I usually spend on inputs, preamps, mics, and plugins for my DAW's.
So many fine toys there are. Can't have them all, but happy with what I have, and might get before life has passed.
Tascam US1800, Presonus 44VSL, M Audio Fast Track USB
Mixcraft Studio 6, Cakewalk Sonar X2a, Studio One Professional, ver 2.5
guitars and keys
PC I7, 750 GB, Firewire and USB 3, Win 7
Asus VivoTab, full Windows 8, 64 Gig
If it sounds good it IS good!