Spent 2 nights getting familiar with my new DP-24. Lots of things to like. It's smaller, lighter and I like the new color display. Much easier to read than the old green-screen. The biggest improvement is SD card based recording. Their list of "approved" SD cards is quite small, but I found the PNY 8gb Class 10 card works fine. It's on sale at Staples for $15 and holds about 25 hours of recording. Another big improvement is the tracks are now stored in WAV format so you can copy and edit them directly from a computer. Just pop the SC card into your computer and you have full access to the tracks. Or use the USB cable. Just be careful you don't mess up the tracks. I found I can take a left/right pair of standard 16bit wav files and copy them to the SD card and use them instead doing an audio transfer. There are a couple gotcha's however. The song must be created first with a dummy track recorded that is slightly shorter than the WAV file. Otherwise you get a serious file error. There is an import function that I haven't tried yet, that allows you to import a stereo WAV file directly into a pair of tracks. This works for me as I tend to do a lot of "tracing". I start with track from a recording I want to cover, and record all my tracks against it, removing the original from the final mix.
The only problem so far is the built-in effects. Like the old 2488, you can use only one of the three, reverb, chorus or delay, but so far it doesn't work as stated in the manual. I need to keep experimenting. I'm very happy with the interface which, although different than the 2488, is very similar in function. If you know how to use the 2488, you can figure out most of the DP-24's functions right away.
I'll report more as I get some recording done. Hopefully someone can help me with the Built-in effects insert.