The Dazzle hardware is ok but the software (last time I tried it) was rubbish. I have found a free bit of software that will take the input from the Dazzle and save it as any type of video format you want, but I can't remember what it was called and I'm at work now.
Unless you want to play around with the output [e.g. compile a DVD] & are happy to simply transfer the contents of each tape to a DVD
You don't need anything other than a couple of A/V leads [less than a fiver]