The brochure advises you to be reasonably fit before you go, because the trek is hard work - not technically difficult, but the altitude and the long days do require a bit of stamina and fitness, and I would suggest that any potential trekkers do take the brochures advice. And take it steady up the first hills!
I used trekking poles and found them useful - and others on the trek who hadn't used them before but had bought some for the trek were really glad they had them.
I took leather walking boots, but the ground underfoot wasn't usually too bad, and lighter boots or "approach shoes" would be OK.
Platypus/camelbacks were useful.
As with all treks try to get local money in as small denominations as you can for taking on the trek
One member of the group who had gluten intolerance had asked if her diet could be catered for was told beforehand it could be, but there were problems, and she wished she had bought more with her - particularly a substitute for breakfast and lunchtime bread I think
The advise to take some energy bars for the longer days was useful - we took trail mix (dried fruit etc) and enjoyed this. I thought it might be rather hot for chocolate, but people who took chocolate didn't seem to have a problem with it melting
The whole local team of cooks, muleteers were very hard working. In the trip notes I think it says something about giving away to them old clothing at the end of the trek - we didn't want to give away "technical" trekking clothes, but took a few cotton T shirts and handed these in for the lottery at the end.