I'm a big fan of Riffworks. This was my first DAW. I still am pretty much using Riffworks exclusively even though I have other DAW's now.
The format is simple - songs are written in Riffs... why not record in them?
The technique is very simple - create a new riff by clicking a button. Choose your InstantDrummer (btw, the InstantDrummer track is a separate track, and does not count towards your max of 24 tracks), choose the intensity and pattern, then switch over to the layers view and click "record". It defaults to 120BPM 4/4 time 8 Bars (all of which are editable). Sonoma offers hundreds of Instant Drummers, all in a large variety of styles and genres.
The record function will automatically start the first track after a 8 bar click, and upon reaching the end of the 8th bar will start recording the second track. If you're set up and ready to go, you can continue recording up to 24 tracks. Each track is pannable, and you can add effects to any track. Riffworks comes with a large built in number of very nice effects, including a two-step flange that pans one flange left and the other right. In headphones, its a VERY nice effect with one flange at the top of the cycle at the same tie the other is at the bottom. Delay, reverb, octaver, compression, filter & wah effects, as well as phase, chorus and flange - all built in.
Track names are all editable, as well as Riff names.
Do you want to have the riff repeated but with a minor change? Just click "duplicate riff". This will copy the entire riff, and you can then edit whatever in that riff you want changed (say, adding a harmony guitar part). This is a VERY cool time saving feature.
Did you make a string noise? click the info window and "draw" a peak down, and it will silence that errant noise.
To build your song, simply drag your riffs into the song layer window. I literally can create a completed 5 minute song with 4 guitar tracks per song, two lead guitar tracks, 2 to 4 synth tracks, all panned and mixed, in two hours. As a song writing tool, Riffworks is absolutely amazing.
An overlooked feature is the "notes" window you can use to write down guitar settings, and even what synth patches you used.
Riffworks also can play REX2 files, a very handy feature which many of the Riffworks afficianados use in their tunes posted on Riffworld, a free service to any musician, but designed to function with Riffworks. Literally, after finishing my two hours of recording, at the press of a button and lots of typing descriptive labels for the song (you can upload it without any description if you're in a hurry), your song can be uploaded in about 90 seconds for a 5 minute song.
The important thing to keep in mind is - Riffworks is fun to use. Songwriting and recording is enjoyable, and not a chore. Try Riffworks T4 for a month (the 4 track free version) and I guarantee you'll spring for the full version. I've written over 100 songs in 1 year on Riffworks, and uploaded 80 of them to Riffworld.
See the screen shot on the Sonoma website to get an idea of how easy it is - and try it. i've been urging Sonoma to add VSTi support (they do work with VST right now, but not VSTi) and MP3 import/WAV import. Riffworks does Rewire into many other DAW's.