Is anyone using a brake master cylinder brace?

[4Aaron GE]

I've got a chance to pick up an old Project Mu unit. If anyone has used a similar piece, how much does it affect brake feel? Does the firewall even do a lot of flexing in our cars?

[Gavin]

firmer peddle if you can get it go for it imo well worth it but then again I had it on when I had the brake upgrade on