I ordered Plusnet fibre broadband on 1 September via Quidco, the transaction tracked quickly and was confirmed on 25 October and ready to claim. The cashback was in my bank account on 31 October so a very smooth transaction. The switch from Sky went to plan with good communication from Plusnet and the router arrived in the post a few days before the activation date. I'm happy with the service from Plusnet and the broadband speed.
Make sure that you clear your cookies before ordering via Quidco and don't use any voucher, discount codes or friend referrals then you shouldn't have a problem getting your cashback.