I'll give you the low down: It's easy to use and you can pump without your business out; you can pump with your shirt on so that means there's no hanging bottles. It works with a lot of popular pumps. I didn't have to worry, it hooked right up to my Medela Pump in Style (which I love and would recommend btw). It can collect up to 8 oz on each side, which is more than enough for me. Actually, if you can pump more than 16 oz in one sitting, you're my milk supply hero! Have large breasts? Me too. Don't worry, they fit and work just as good as they would on the smaller endowed. Like anything new, you have to get the hang of using the collection cups and moving your milk over to the bottle or freezer bags but if you practice with water first, you'll get the hang of it pretty quickly.
These are totally easy to find, whether it's in their site or they're also available at Walmart and Target!
Have you tried the Nuk Simply Natural Freemie Collection Cups?