I had a stint when I first started playing in '04...I built to about 1500 and I couldn't make 1600 for the life of me. Took me like 3 weeks to break 1600.
Aside from that, my only real "problem" has been some of the limit jumps. When I have half of my weekly paycheck on each table (and the whole paycheck if I double through), it's definitely hard to treat it how I should.
It really caused me some emotional swings.