Disagree - If you've never owned or seen a Mity-Vac, you can't comment on its quality.
I have to agree with Rikter8's statement above. You can get the Mityvac Brake Bleeding Kit from Amazon.com for under $30. Personally I've never used plastic hand pumps or hand pumps without gauges and before ordering my last Mity had always purchased hand pumps (other brands) from auto supply stores.
Thank you, Gents! I love it when anecdotal data comes in to support a point made earlier.
socalanfmodel - listen bro - take it easy with the bling new toy when you get it out of the box and hook it together. ;> It is VERY easy to injure yourself with one of these in just a *minute* of over-enthusiasm. You need to give your body time and room to grow into the new pressures you will be placing on it. Tissues and the cavernosa of your shaft are not meant to be *slam-inflated* with blood. Work up a good, semi-stiffy to a full erection before you lube up and plug into your tube. Use gentle, slow pulls to take the vacuum up gradually. Work the vacuum back and forth a little, vacuum will drop in the tube as your tissues expand, but go low and slow for the first few weeks. Pull on more vacuum gently and slowly when the pressure drops, keep that needle hovering at 3" Hg. The key to gains is *time spent* in this engorged state and if you're too forceful, you'll experience pain and hurt that limits your time and ability to linger in the tube.
Like others above, I *suggest* no more than 3" mercury, 10 minutes at a time for the first 2, 3 weeks, 2, 3x/day tops. After 2/3 weeks, decide if you can do longer intervals, only slightly bumping pressure as your senses/body will allow.
Always end on a hot towel wrap, massage/masturbation to erection for 10 minutes afterwords, keeping the equipment limber and to assess if you hurt yourself.

And CLEANLINESS cannot be overstressed. Keep your tube(s) pump clean, the acrylic tubes can be stood upright in the dishwasher if you are that lazy - dishwashing detergents will strip the lube and gunk out quickly and safely - the chlorine contained in it and high water temps also sanitize. A cruddy-assed tube is not only nasty to feel but you do not want to give yourself a really easily avoidable skin infection.