I have a 701, no real problems with it, its handy for board repairs as a hobbyist but if I was doing it as business I would get a Hakko or Pace unit. I use Hakko Equipment at work and it is the bees knees. The Hakko desoldering gun pump is a duel action piston pump(from memory) and the 701 is single action, anyway, I know that the hakko desolder is far better than the 701. However, there is no way that I can justify the cost of a Hakko unit for HUO. If I want to do a really good job, or I am working on a really fried CCT board, I will take it to work and fix it there, for everything else the 701 is good enough. Hope this helps.
Cheers,
Dan.