5m Sliding Door - 2 panels too heavy?

You'd only need one sliding & one fixed, right?

Can't anser your question about the weight for kids but the Vendor should be able to speak to it based on his experience.

Sliding door you've maintenance on the rollers

More to go wrong on the swingjng doors ?

Depends on the age of the kids but should be easily opened with the lift & slide by a 7-8 year old

I don't go there except for small ones and even at that..

Am in a house at the mo with 4 that are there 20 years, all 4 are FOBAR and I risk putting out a disc when opening some of them, parts unavailable