Bang for buck, the R24 is hard to beat. Most multitracks only download recorded tracks to your DAW. The Zoom can do that, *or* it can record direct to the computer, and is compatible with most recording software. It records up to 8 tracks simultaneously, has 8 XLR/1/4" combo inputs, 6 of them with 24V or 48V phantom power, including one that can be configured for high-z (a direct guitar/bass input). It also has built in stereo mics, and can run on batteries. It has extensive FX, modeling, and sampling capabilities. That's the good news. Here is what I consider it's biggest limitation: It can only do all of that in 16bit/44.1 kHz. It *can* record in 24bit/48kHz, but if it does, it's a stereo recorder- only 2 tracks simultaneous recording, and you can't use all of that FX, modeling, and sampling. Considering its price, and its other capabilities, that's a reasonable trade-off. Pretty much, name any other machine that comes even close in capabilities, and it will cost a lot more, and I can rattle off a good sized list of the things the Zoom does that it *can't* do.
From the little H4n, to the R16, to their bigger brother, the R24, this line of recorders represents a new concept in portable recording devices, which can act as self-contained, battery-powered standalone recorders with removable media, *or* as computer controllers, using the DAW of your choice. The only things I wish they had are a built in CD-R drive, and global 24 bit recording capability. Best of luck-Richie