Sennheiser. If you know the name then you know the respect they command in the audio industry. This year, they've refreshed their line of gaming headsets with the brand new GSP series. We've looked at the GSP 500 and 600 but today, we're reviewing the most exciting option yet: the GSP 550. It follows the 500s open-ear design and includes Dolby 7.1 surround sound, but for $249 is it worth the price of entry?