I agree with cfitz & BuddhaTB.
Even with the £7 difference, the 52x drive is a better deal. It's brand new and you
might be able to flash it with firmware from the next newer model from Lite On, what ever that may be.
Most of Lite On's past drives had this abaility to use firmware from a newer drive to upgrade yours.
I own the LTR 52246S and am very pleased.
The £7 difference is about the cost of 2 pints and a tip, is it not?
I know money is always tight. But the drive will be around a lot longer than a pint.
Besides, your m8's will be envious.
If you really can't justify the more expensive drive, you'll probably still be happy with the slower one.
(edit: sorry BuddhaTB, I neglected to give you credit too

)