Summit exhaust systems, are they decent?

I used their 3" kit on my Barracuda but my exhaust guy said he still had to do a lot of tweaking to get it to fit well. I have TTI headers too, not Hooker so I`m sure that played a part. The mufflers (if they can be referred to as such) are LOUD. I ended up using resonators in combination with their two-pass turbo mufflers to make the car sound good without being obnoxious.