You do NOT climb to 6476m as advertised, that it Mera North, the route to which is heavily crevassed. On this trip you climb Mera Central 6461m, Exodus really need to amend their trip notes, so although I reached the objective of this trip I did not climb to the top of Mera Peak!
Watch out for the leeches in the lower camps.
FYI the crew set up 2 toilet tents at most camps, they are great, there is a chair inside with a loo seat, so no squatting!!!
You can pay a couple of dollars to use showers at nearby lodges at some campsites, plus the bowls of hot water supplied by the staff mean you can keep quite clean.
Don't waste your money on iodine stuff, the guides boil water and fill your bottles at breakfast, lunch and dinner, so you can get as much safe water as you can drink.
Your plastic boots, ice axe and crampons are separated out in Kathmandu and sent ahead, so you don't have to carry them around, this also gives you more room in your kit bag.
As mentioned by someone else, this is a long-old-trek, with lots and lots of ups and downs, you will ascend and descend over 10,000 metres of the course of the trip, so be prepared. The summit day is a 12 hour walking day, 6 hours up starting at 2am, and six hours down to a lower camp, so make sure your plastic boots are comfy.
Oh, and don't take any electronics with hard-drives in them. My hard-drive mp3 player and hard-drive camcorder stopped working at about 5000m because they don't operate in low pressure environments (they worked again lower down), so watch out.