B&Q underlay - any good?

BB1984

Has anyone used B&Q carpet underlay? I have been looking at tradepriced.co.uk which seems to have very good prices, but B&Q are comparable at the moment (15% off) so I wondered if I might just as well buy from there.

I plan to use a thicker, more expensive underlay in the lounge and main bedroom, and the thinner one in the hallway and spare bedrooms.

Here are my options (whittled down after much research!):

Tredaire Colours Green - 10.3mm thick, 1.47 tog, 44 db sound reduction - £5.74/sq.m
B&Q 5* - 10.8mm thick, 1.3 tog, 40 db sound reduction - £5.08/sq.m

Tredaire Sterling - 6.9mm thick, 1.26 tog, 28 db sound reduction - £2.29/sq.m
B&Q 3* - 7.5mm thick, 1.1 tog, 25 db sound reduction - £3.38/sq.m

Any thoughts? I haven't included delivery costs for the Tredaire stuff (but only about £25 for the whole lot)

Obviously I want to save money where poss, but equally we're buying decent carpet so I want to buy decent underlay to look after it.

All advice gratefully received, as always

BB