I fly mostly 3 cell 1800-2200 batteries in my planes.
Quite a few of my fellow fliers use the same size.
Some guys choose to use the high priced batteries
claiming higher performance...that's not what I see.
You need to pick the right C rating for your use, higher is always better.
I get just as many flights and cycles as they do at half the cost.
You can choose which style of connector you want.
Buy some and see for yourself, I thinks it's a good value.