I didn't get on with them but, cos I had broken my specs I kept them in after I got home from work. It appeared that screens (computer or TV) just dried them out and I would have to pour drops in.
They were great during the day though, just take them out after work/ for tv watching.
if u mean the ones u take out over night, but last a month then i found them a little uncomfotable but worth it if ur wearing them everyday. i now prefere daily's as i dont where them all the time and there more comfortable by a long shot.
my fella has been using them for about twelve months and really likes them-the ones that you leave in over night are the ones he has now, the ones he used to have to take out for bed weren't that great.