Fisher GS fit

Hi! I'm considering a used Gary Fisher Tassajara GS, but it's a bit of a drive for me to check out. It's a 17.5, which is perfect seat tube wise, but I'm concerned that the top tube will be too long.
I'm 5'6.5", am I in the range that the 17.5 is aimed at?
Are the seat tube angles slack or steep on the genesisters frames? If most of that massive top tube is behind the bottom bracket I'll be fine, my legs are very long and I usually have to push the saddle far back.
Any other insight into the genesisters geometry would be welcomed. Thanks!