Just checked my Bitcoin address and I've been mining since Oct 2012
Started on graphics cards. A mix of 6770(died pretty quickly), 5830s (because they were cheap) and 7850s (because they were power efficient) I was part time mining and part time gaming.
I gave up mining Bitcoin in June 2013 because it came unprofitable due to ASICs and switched to Litecoin.
Came back to Bitcoin Nov 2013 buying 270GH of ASICs expecting to mine early December, but they didn't deliver 5/6 until January which ruined my ROI plans.
Unlike other people buying Avalon/BFL I gambled on Bitfury staying in the game longer because it was lower power.
I've got another 520GH of Bitmine A1 chips on order for delivery mid Feb. Lets see how that goes.
Made 8.8BTC with GPUs, blew it all on ASICs, ROI only 1.6BTC so far, but 2/3rds not mining yet.