This question has been asked many times in this section.
If you want to get better at poker, use them. If you don't, don't use them. That's pretty much the bottom line.
Before I started our company, over 12+ years ago, the primary thing I'd attribute to climbing to play nosebleed stakes so far was the use of a HUD and the ability to track and replay my
hands. Being able to review my play, share my hands w/ other poker friends and get feedback, was the reason I started w/ one $50 deposit, and was playing nosebleeds within a year.
I'm biased of course, but Drivehud 2 offers a free fully functional 30 day trial. We have support on Cardschat, and other major poker forums, as well as near 24/7 email support.