Hi Mike,
There is no loss in quality. In fact the local DID number called is assigned to the SIM - not 'redirected'. DIDs are stocked directly on the SIP server.
Like I wrote in an earlier post, we will soon offer a larger choice of DIDs including 60 different US area codes.
If you need a specific number not yet available on the website please email me and I will see what we can do.
Florian