Yes, I use it for every bounties and airdrops. So the address is everywhere right now, just waiting for the result and I can't change it.
I don't think there's any problem as such with MEW as such. MEW is still the best way to use ETH transactions. Infact all the software like metamask uses MEW in one or other way. So you can easily import MEW keys into metamask and then use it to transact. Right?