servo help!!!??

[martboy21]

i have been running a standard tamiya servo in my ft b4 for a while now

when compared to all the top bods down at eden park raceway thers can go from full left to full right and back again before mine even does it once!!

really dont wanna spend 50 pounds etc on a AE one or ko so what about this one?

http://cgi.ebay.co.uk/ws/eBayISAPI.d...77&mfe=sidebar

input really appreciated