I have the tri-ax and I enjoy it, Im going to switch to the mgw just because of the raving I have heard about it.
Save the money. I did this swap barley notice the difference. I should of just kept the Steeda and spent the money on the MGW dress up parts for the inside of the car and engine. It is less notchy then the Steeda but notchy was never a concern to me i kind of liked it. Just my $0.02