I bought Top Climber.Did you get the Top Climber or Mast Climber? The Top Climber hasn't been made for a number of years.
I have the Mast Climber and it works really well. Just practice a bit going up and down the lower 10' of the mast to get used to how it works. It took me a while to figure out how far to descend per step when coming down.
You should have someone tailing you on a backup halyard for safety.