lol... for between $300-$500 you think that they would at least come with a spring. Fox Racing do make shocks with springs but I like the Fox float shox. I don't no specifically how they work except its done with air and some very clever engineering. But they do look cool...
I know a guy who has a crf 50(88) with 1 in it, what a nice ride. I am 6' 100kg, he flicked a knob on it and it held my weight with ease, smooth but still firm.. here is a pic of his shock, sorry but I took the pic with my phone.
fastace are ok some of there more expensive shocks are preety decent but ishock ,fox,elka,sachs,ohlins,showa,dms shocks are the best ,that fox float shock is so nice its heaps similar to the aussie designed rss shock which is springless