I have tried various different brands of monthly disposable lenses, and have often had difficulty finding ones that work well for me as I work on the computer constantly at work, and don't blink very often (which I should, I know!). Therefore it has been hard finding ones that feel comfortable and keep my eyes feeling moisturised and not grainy. I found the Air Optix Aqua lenses to be pretty good in this sense, as I wasn't generally aware that I had lenses in my eyes, which is a sign of a good lens! Although the normal Air Optix lenses are pretty good, after a trial from my optician, I have since changed to Air Optix Aqua, and I find these just slightly better (the moisturisation level is a little better). I've been using them for the past year and am pretty happy with them. You get 3 lenses to a case, so 2 packs of lenses will give you 3 months worth of lenses. I currently purchase my Air Optix Aqua from Posh Eyes website, as they work out pretty cheap compared to buying them from my optician. I tend to buy 6 months worth as the savings are even better.