We are travelling from the UK to Abu Dhabi with LH via FRA and have 4+ hours and I too have been researching whether to purchase lounge tickets.

This thread has answered one question though re whether you can purchase any of the LH lounges which obviously you cannot so Luxx Lounge looks like the only option.

Debating whether it is worth £50 for two of us or do we just hang around, get something to eat in one of the rather expensive restaurants?? Interesting if Wifi is now only 5 euros?

Cannot see from the website though re food in the Luxx Lounge, I did read snacks but wondered whether there was any hot food served?

Seems rather pricey at £25pp compared to what we have paid in other Airports which is usually between £15 and £18 per person?