Never had a problem with Poloniex...yet!
Good article...good warning. I don't have enough tied into Poloniex to make a difference to anything though...unfortunately.
What exchanges would you recommend as being safe...or having a lasting business model?
I have several exchange accounts...but haven't had any issues with them yet. Kraken is slow as hell I know.
CEX.io seems very fast with customer support...but I still can't locate where a couple of their fees are coming from.
VirWox is terribly expensive and I wouldn't recommend it anyways.
Coinbase has been great to me so far.
That's all my personal exchange experience to date!