Out of all the feeders we've had, we've had the most success with this one, in that the birds prefer this one over the others. As another reviewer noted, no yellow parts to attract bees. The 8 oz size of the bottle is perfect, because it's a nice balance between having to fill it up too frequently with nectar and having the nectar sit there too long to spoil.
I also like that the upside down bottle ensures that gravity will keep the feeder part full. And I like with just a glance, you can look at the bottle and tell h how low the feeder is.
Cleaning is easy enough as the bottle twists off easily leaving you the bottle and two other pieces of plastic to clean. A little brush and hot water, then refill. Every so often (when you start to see schmutz building up), soak all the pieces in a small mix of bleach and water and let it soak for 30 minutes and you're done.
There are 8 feeding holes (not entirely sure b/c feeder not in front of me) for the birds which is more than fine (I've only had 4 birds feeding at one time, which is actually a lot given hummingbird behavior). However, you should be aware that the hummingbirds will eventually come to this feeder and mainly perch while feeding (as opposed to hovering while they feed).
There's no ant moat per se, but you can apply mineral or castor oil to a cotton swab and dab it on the provided hanging wire, and I've found this works well for dealing with ants. Even better is to get an ant moat and fill it with mineral oil (or castor oil), and it won't evaporate so you can fill it and forget it. (I prefer the "Detourant Ant Guard" as it's not effected by rain and regular birds won't try to inadvertently drink the oil).
And replacement parts are easy to find online, though I've just order whole new ones in the past.
And for you novices, you can easily make your own nectar using 1 part sugar to 4 parts water, boil it for about a minute, and refrigerate for storage. Let it cool before serving of course.