I just bought a used frame that is coming this week. The frame has MegaExo BB already installed.
I already have Shimano 105 crankset 53/39. I understand I cannot use it with MegaExo BB. But I am planning to replace 53/39 with 50/34 anyway later this year.

Here is my question: Should I stick with MegaExo system and buy 50/34 FSA crankset, or replace the BB no the frame to let say Ultegra and use my own crankset until I got Shimano replacement?

I have read a mixed reviews about MegaExo, some are not happy with it. Please share your experience if you have one, THANKS!!!!!