[Q] MobiCity UK - S3 i9305 4G LTE

Hi,

I'm new to smartphones and am looking to buy the Samsung Galaxy S3 i9305 4G LTE 16GB from MobiCity UK (I'm based in the UK). I've looked at the standard (non LTE) version but want to buy SIM free and with some future proofing.

Under 'Specifications' it states 'Important Information' as "This discounted stock has a HK ROM with UK or US English locales."

Questions:

1) Is this safe to buy? What does this mean: 'HK ROM'?

2) Anyone had any dealings with MobiCity UK and if so, are they any good?

Many thanks.