They do work with Shimano mechs. They were only every made in 8 speed. The housings were very brittle and loads of them have fallen to bits. If you want seven speed look out some SRT series, probably a better bet in my book.
Sound advice there! Bear in mind that it's especially important to use the SRT prefix shifters and not anything with ESP mentioned, these are only compatible with SRAM mechs which have a different degree of cable pull (i.e Shimano won't work).
It's also worth looking for Sachs Wavey if you fancy another option - I've had a pair in the past and they are really rather good. Other folks on here also speak highly of them, they tend to crop up on Ebay once in a while, often in NOS condition for some reason...
Several bikes, one supportive lady and still trying not to buy anything else!