The Collections module lacks some features (so far I’ve found such a lack):
Ability to display or not to display fields in the list of collection entries
Ability to custom sort by specified field. Right now the entries are placed in descending order (new ones at the top), but I, for example, need a different sorting, so I created a field called “Sort” for that
The ability to simply copy a row of records (to create, for example, in Collection the list of records I need in advance). This is convenient if you have a lot of records of the same type, which may slightly differ from each other, and it’s easier to copy them than to re-fill the fields when creating a new record.