Their pricing scheme is a bit deceptive:
Viper (Scrypt) Miner (25Mh/s)
£1,635
30% Deposit Required: £1635.
Total price: £5450. Remainder will need to be paid 8-10 weeks before shipment. Shipment will be extra, which shall be notified during final payment.
That's about $10K total cost. I think it's too much.
Litecoin miners are not cheap to produce.
There is little saving in the way of hardware cost to graphics card, the saving is in the power consumption and heat, and the amount of hashrate a household can feasibly sustain if you want to max the circuit...