Yes there are. I have one now and with the dual video cars it can cause screen delay and glitchy images when browsing especially noticeable using the forum. Long wake up time from sleep (for a computer), and some random issues I'd never had with my MBP from 2008.
On the plus the 15'' is awesomely light, and quite, good battery and the screen is awesome.
But for me I'd rather have a brand new 08 version then this one so not worth the 4k I paid, and I won't be getting another one if this one dies.