I'll start by saying this is the only pump I have used, so can't compare to others.
Bought at target on special, from memory under $100.
First used when my milk came in, i was very full and uncomfy.
Found it easy to use, the first 6 months I had abundant and excessive milk supply, so used this pump on an almost daily basis.
I am fortunate that having a good supply I could easily express over 100mls after a feed. It allowed me to store a good deal in freezer, not that it really got used ! But i had it if i needed it.
I never sterilised mine, only washed in hot soapy water. A little fiddly to pull apart the valves etc but it didn't bother me, the only worry I had was the small rubber pieces getting sucked down the sink drain. It never happened and replacement parts can be sourced i believe.
Let-down stimulated easily, i could also angle and adjust the pressure i put on breast with the pump which was really useful helping ot clear blocked ducts.
The via system very handy . I could express into the cup and freeze straight away, or add to again later.
Also my son is 2.5, i still use the via cups for freezing leftovers fo rhim now.
With baby number 2 due soon, I am sure my pump is going to get antoehr workout. I would say has been one of my most useful purchases, good value and the only things i'm needed to replace are cups and lids as they have dimisnished over the past few years.