I started with the 3 inch and then went to the win pack. I didn't like that there wasn't a tight seal in the 3 inch. My beer seems better with the winpack but I've only been doing this for about 2 years.
ipscman:
I'm just starting to do all-grain. So I haven't done this yet but test out equipment as I get it. I got the carboy with spigot that you posted about. I done a few tests now. First with filling it with boiling water and seeing the next day with no visible contraction. No hiss of air...
ipscman, when it cools, does it create a vacuum? I did a test with mine, using just boiled water, I squeezed some air out and the next morning its shape was normal. I just used the cube as is with its own caps.