Electronic/Machine Foot/Ankle/Calves Massagers

Has anyone got one of these, and would you recommend them?

I am looking at getting an electronic foot massager, but there are a fair few to choose from, varying quite widely in price, and I am struggling to find a showroom/shop where I can actually physically TRY before I buy, so any recommendations would be appreciated, both for the actual product, or better still, a store (ideally in London) where I could try a few of the machines out, and then decide.

Have so far found:

SANYO Foot Massager HER-FA500 with heat therapy and shiatsu, £480 (www.amazon.co.uk/SANYO-Massag.../ref=pd_cp_d_2)

uComfoot Warm Leg Massager (Upgraded iComFoot) - Massage Thighs, Knees, Calves, Ankles and Feet with Sole Shiatsu and Infrared Heat Therapy £530 (www.amazon.co.uk/uComfoot-War...519684&sr=1-28)

TK528 FOOT Massager £385 (www.amazon.co.uk/HBR-Health-B...pd_sim_sbs_d_3)

and

Foot Ankle Calves Calf Leg Legs Massager, £200 (cgi.ebay.co.uk/New-Foot-Ankle...85968983351048)

So, quite a price difference, if the £500+ one is mega awesome, I'd seriously be tempted, but not sure how much more mega awesome it is compared to the £200 one?

Thanks in advance.