NBG, DH and I have had a LCI / Club la Costa 'freebie' holiday. We had to go to a 4 hour presentation in Rotherham (before kids - you can't take them along with you). We had already planned our 'attack 'before hand and stuck with the story that we spent £1000 on a 4 week holiday backpacking in Thailand, and yes, this is how we liked to holiday - ie Big Fat NO to a timeshare. We came away with a voucher for a week in Tenerife (paid extra for specifying date and destination), with usual admin fees etc. The flight was OK - an early morning charter flight from Manchester (but no meal!!) The timeshare resort was beautiful - 'more luxurious than 5 star' as LCI kept telling us! However, it was still being built and a huge crane and workmen were our view from the balcony! Also it was next to umpteen golf courses, there was no public transport and it was a fair journey to the nearest town. We also had to attend another timeshare pitch - we were chauffer driven there but had to catch the bus to the resort and a taxi back to the apartment when again we stuck to our 'cheap backpacking holiday' story. One sales person asked us why we were here at all if we preferred backpacking and DH and I replied - you offered us a free holiday - why not?
You need a strong head to endure the sales pitch, but if you can do it, you will have a good time!
Just tell them you own a string of villas on the Algarve if you don't like backpacking