Probably the high level of use is due to my habit of having one or two of each of my preferred AVRs already configured for debugging so all I have to do is drop one in a board, wire up the circuit, then connect a couple of wires from the Dragon and I'm ready to go. I use it mostly for debugging then programming. I use my Dragon now about 80% of the time. You have to figure out what you will be doing to decided which one fits your needs. You even have to put your own feet on the board. You have to buy your own USB cable and jumpers. You have to solder you own headers and sockets. You just get the board with two headers soldered, power and JTAG. It will never support uCs with more the 32K memory. The downsides are that it only works on a handful of uCs at the moment. Development time can be decreased enormously. You use the actual uC in the circuit hooked up with certain limitations. It can do In Circuit Emulation which allows for a great amount of control and ease when developing a project. There is rumour of a newer STK500 coming called the STK500X that will probably run off of USB as well but that maybe be a ways off. The idea is that you can put the uC in the board and do your testing on it. It still needs a external adaptor that you buy separately. It also comes ready to go with cables, software, and paper work.
It has other hardware on board like power supplies, RS232, external clock, headers, switches, LEDs, memory, etc. There are expander boards for other packages. It has sockets for almost all the DIP size packages. They can program in ISP, PP, and HV modes. Lets talk about what they have in common first. They are different devices for different jobs.
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