What Blackshiver says re Singing Rock which are a complete faff and nowhere near as nice as the bog-standard Petzl.
WHAT UTTTER AND COMPLETE CARP!!!
I've got a singing rock harness (The yellow one) well when I say "old" its only 3/4 years old)) and I get on with it fine!!
I've done countless trips, mines all over the place and even the odd c**e (we are allowed to use that that word here, aren't we?).
My SRT kit is beautiful, it allows me to go down as well as up and is comfy!!
So "Yar boooo sucks!" to all those who diss the singing rock harness!!
I bought it on the recommendation of well known "most fearless mine explorer in all christendom" (The Lord Mouldington) and notice that the "venerable" (Simply Exploring) has one as well.
If its good enough for them, its good enough for me!!
Try as many as you can before you buy (that's what I did) and get the one that YOU feel most comfortable in!
Better to regret something you have done - than to regret something you have not done.