I've got the LS-2, Custom Barge and Xotic all on my board at moment and I rank them like this
Xotic
LS-2
Barge
They all do a similar job and have their own pros and cons, well the Xotic's only con is cost other than that it's flawless.
LS-2 isn't noisy unless you crank the volumes and then you'd be boosting your signal and you don't really want to be doing that.
The LS-2 is always worth having around it's so useful and does so much stuff.
I've not tried the Radial but it's top notch stuff and while I'm not the biggest fan off boss there isn't really anything more roadworthy