Although I don't need all the features provided, I use Merlin because :
It works, it is well tested and stable.
If there are any issues Merlin is quick to deal with them.
Merlin is also supported by a community of very knowledgeable people, the help and information on this site are better than you could find anywhere else.
You know you have the correct firmware for your router, there are too many "official" versions around.
You have nothing to lose, if you don't like it you can flash in something else.
It works, it is well tested and stable.
If there are any issues Merlin is quick to deal with them.
Merlin is also supported by a community of very knowledgeable people, the help and information on this site are better than you could find anywhere else.
You know you have the correct firmware for your router, there are too many "official" versions around.
You have nothing to lose, if you don't like it you can flash in something else.