Bryston Speaker Selector w/ Headphone Output

Not sure WHERE is the best place to post a question like this ... I have a Bryston speaker selector unit with a headphone output:

http://www.audioadvisor.com/prodinfo.asp?number=BYSWBO&variation=3WAY

This obviously takes the signel from the speaker terminals of the main speaker amplifier and sends it to the headphone output.

My question is, how would this type of headphone connection compare to a dedicated headphone amp??  Currently using Grado SR60's but would like to step up to something more refined.  Would this type of amplification for phones work with most/all higher end models of phones?? 

thx!

Jeff

Sounds good BUT I have no experience with a dedicated headphone amp so not sure if I may be missing anything significant with the Bryston selector.  Maybe one of these days I will buy a head amp and compare.

The Bryston piece IS expensive.  The 3 speaker unit is $620 through AudioAdvisor however if you can find one on eBay or AudiogoN they can be CHEAP.  I think I paid $150 on eBay for the 3 speaker unit.

My only criticism of it pretains to its use as a speaker selector - the terminals are too tighly spaced to easily accomodate spades ... bananas are almost a must.  If they would have just made the chassis larger, it would be perfect for its intended use in all situations.

Jeff