MSI Wind/Advent 4211/Medion E1210 Replacement battery

Has anyone purchased a 6cell battery for their Wind or wind clone?

Where did you buy it from and are you happy with its performance etc. Was it 4400mAh or 5200mAh?

Im torn between the medion which is £48.74 plus £2.99 del (states 4400mAh on the site but may be 5200mAh)

or

the 4400mAh from batterybud which is £42.08 delivered

Thanks in advance for your help

Des