Unfortunately I can't remember how I learnt about the site. It's possible it was through this site as I've not checked out other Bitcoin forums.
I signed up in April 2014 if that's any help.
The first red flag for me was that I raised a support ticket which was promptly deleted without any sign of it being resolved. I posted about it in the forums and was told I was being unreasonable expecting support on a beta site and that Admin had no time to reply to all tickets if the problem was resolved. Pointing out my problem wasn't resolved I was told to raise another ticket.
That's the point I concluded the site was either a scam or just badly run. I still erred towards the latter at that point. Annoyingly I couldn't properly exit the site as there'd been a massive drop in price of KHS at that point so whilst I was able to increase my position significantly I wasn't able to retrieve my original investment, I was close but not close enough. I decided to try and get clinical and ran a spreadsheet but the way the price dropped and the fact I have a job and couldn't capitalise on the random increases meant I couldn't make money quick enough. As I've said, wrote the money off and reinvested to have 5000KHS and have left it rolling ever since pulling money out as and when I can.
I can't give an exact time frame over this but I would guess at June 2014 I first used the word scam in relation to this site. Since then I've been trying to claw back that money.
I doubt I'll get my 0.4BTC back but I didn't spend what I couldn't afford to lose.