LiteOn DS-4E1S - what speed BD-ROM reading?

Thinking of buying the LiteOn DS-4E1S, its not listed on lite-on’s website so can’t see firmware updates, also the specs on the following link say 2x for BD-ROM and BD-ROM DL:

BUT on here it says 4.8x:

If this can do 4/4.8x i’ll buy this, if not i’ll go with the Sony Optiarc BC-5500S which is definately 4x.

Anyone know, anyone got a link to firmware updates for the lite-on?

got this email response from liteon:

Dear Sir or Madam,
Thank you for your feedback.
Please be informed that the reading speed of this model for BDROM and BDROM-DL discs is 4X .

Best regards,