Actually all of the Dataq starter kits are a pretty good deal for the buck. I have used them as well as their commercial line of products. One feature I like is they provide an Active X component making writing software around them real easy for data acquisition projects.
I am far from a programmer but even I can get along with those things in Visual Basic. The $25 buck unit mentioned is really a good deal and the only reason it is $25 is because they are getting rid of them. The RS232 interface makes them a hard sell anymore as was mentioned.
The WINDAQ software included with the modules also works great as to recording data for playback.
Ron