Glass Packs

I've considered these over the Super Turbo's I have now. Did you use anything else prior to these to compare them too?
Some kind of Dynomax oval mufflers (came on the car). Then tried Smithy's glasspacks, they were nasty. Worst sound ever. Finally settled on the Borlas. They are almost straight-thru, but much more mellow than those glasspacks. Still a bit loud though. Not sure if I'd want to take any real long trips with them!