I use bottoms for all my hives. Then, I also use upper entrances, which are NOT top entrances.
Upper entrances are entrances on the second brood chamber, or on the supers above the excluder, keeping mind the importance of trapped heat.
It may not be as important during honey season when the temps are high anyways, but having an upper entrance in the brood chamber the rest of the year allows for the bees to regulate moisture and air flow better, provides a secondary entrance for snow/ice issues, etc. The upper entrances in the supers allow bees to enter the hive without going through the brood chamber.
Upper entrances, taking into account trapped heat and the benefits of such for early brood rearinf, etc., ....a good thing.
Top entrances....I see nothing beneficial.