The cheapest deal i've seen elsewhere for the Mountech Motion Maxi is £143, so for less than £100 it is a bargain. There may be other cheap brackets that you can get for less, but there aren't many that can hold 70kg AND move as smoothly as this one. It mentions that in some stores the item may be ex-display, but the one I got from the Leicester store was new and fully boxed with all the instructions. It's a high quality piece of kit, with reviews almost everywhere getting top marks (with the only negatives being the high price).
The Motion Maxi MAC882 is suitable for TVs from 37 inch to 55 inch and up to 70KG in weight, making it suitable for plasma TVs. It's also fitted with adjustable attachments, so this bracket works with almost any large screen TV and it features a sophisticated cantilever mechanism that lets you both tilt and swivel the TV.
Supplied fully assembled and designed and built in the UK, you know that you're not getting cheap foreign rubbish.