*** We're not affiliated with the ALL In One Wine Pump company, we just LOVE our AIO***
My hubby just started brewing, and I'm ever so glad I already have an AIO from my wine making hobby!
I use it for transferring (primary-to-secondary & carboy-to-carboy), in-transfer degassing, filtering and bottling of wines. That's great about it, other than being multifunctional and decently priced is that you are doing so much without the presence of O2 in the receiving vessel.
As far as brewing, my hubby is planning to use it for his transferring from primary (Ale Pail) to carboy, to and from carboys, from carboy to keg, and to bottle(if he's kegless ATM). He is also planning to filter while in the kegging process, because we have the recommended whole house filter setup Again, since it is under vacuum, there is no 02 present in the receiving vessel. This drastically minimizes risk of oxidation IMHO.
Other perks to using an AIO are:
1) The AIO and the filter set-up, even though the price is comparable or lower than other pump models available.
2) Racking time is been decreased tremendously, plus I don't have to risk hurting myself or breaking a carboy because it needs to be lifted.
3) Bottling time has drastically fallen and the AIO allows a perfect level on every bottle every time.
4) Steve's customer service is TOP-NOTCH! We've spoken a few times and his support is above and beyond excellent.