GIMBAL Ball Head ? any good...

[mark richards]

need a more fluid movement on tripod, are these worth the money? are the cheaper ones, just as good? ...http://www.ebay.co.uk/itm/GIMBAL-Ball-Head-Bird-Swing-For-Camera-DLSR-SLR-Tripod-Telephoto-Lenses-Load-8kg-/200708917795?pt=UK_Tripods_Monopods&hash=item2ebb2f0a23
using a ball-head at moment...thanks.