Never found the sales staff in the Slough branch much good mate! Mostly curt, unhelpful and not too clued up on what they were selling......If this is reflected in their aftersales service, I'd shop elsewhere.
However, each to their own.....pop into GW and sus' it out for yourself. You may have a better experience than me. They seem to move alot of stock and the workshop is always busy (Both mechanics come highly recommended by a friend of mine, himself a motorcycle mechanic for many years).
Good hunting!