Seeing how I just replaced my S&A magwell/msh with the Dawson Ice (which also comes as a separate msh and magwell, but need to be used together) I will try and weigh them both, but I honestly didn't notice much of a difference in weight. The DP seemed a little lighter as the S&A has some heft to it.
Jesse, you will see the difference this weekend at the match, so you can kind of judge what you think.
Correct me if I am wrong, but the Techwell must use their grips, right? Don't they have a proprietary "locking" of the grips/magwell together? Personally, I like the S&A and the DP since you can use whatever grips you want...for me, it was in conjunction with VZ Operator II grips...