I actually just made a post about this. I've been trading on Whaleclub with Bitcoin, mostly on a Forex type exchange. I started with a few bucks and worked my way up to about $80 of BTC. I use the DEMO a lot to test ideas, but I've made a good amount of real money as well.

https://whaleclub.co/join/GZRFCR

Here is an older screenshot showing my successful and unsuccessful trades: