As far as looks go, that's buyers choice. I could care less if something is pretty or not, as long as it makes me faster!
I checked my facts and found this:
Muzzy's M10 is $879, Brock's ShortMeg is $1045. Both SS, both full systems. Muzzy's standard full system is $499, (stainless with aluminum can) Brock's (stainless with aluminum can) is $1065. All this pricing is from Schnitz website.
No Muzzy's doesn't offer map support, in fact their customer service is horrible, but for the price difference you can get a custom tune. Yeah, everything has gone up everywhere, you oughta price race fuel!
Not wanting to bash Brock or his products by any means, he's popular for good reason, just stating why I personally shop elsewhere.