Im not sure i understand your questions...What is it you wish to know? If serrations are hard to sharpen? If Benchmades serrations cut good? If you should stick with a plain blade?
I like serrations in knives meant for certain functions. For example, my fishing knife is a H2O Griptilian combo edge. I find the serrations useful for cutting through bones, tailfins, severing fishheads, etc. I dont like/need serrations on my hiking blades or any other blade meant for woodwork.
To my knowledge, Benchmade does not make any fully-serrated models. Their serrations are the "3-point" style, very similar to Spydercos. They cut perfectly fine. Personally i prefer them to, say for example, Kershaws/ZT's serrations.
If you have acces to a Spyderco Sharpmaker or any other rod-style sharpener, then serrations are a breeze to sharpen and they hold their edge for ages.