Is contiki good? Thailand Laos and Cambodia trip

Hi, I’m a 19F from UK.

I want to travel SEA this summer I don’t have anyone to go with so I’m looking at the contiki group travel.

I just wanted to ask has anyone else done this trip?? And their reviews?

Also if anyone knows what the demographic is like I know it says 18-35 year olds but what is the majority in age. And also if anyone knows what country most of the travelers are from (I’m just curious if other British or English speaking people go on it). And also is it majority female or male?

I know it would be much cheaper to go on my own and travel myself but I’ve never even gone on a holiday on my own, maybe after this I would do a solo travel but I wanted my first experience to be with a group.

If anyone has any general advice about contiki I would really appreciate it!! Thank you

also any other versions of contiki I would be open to booking