If Eric helped you make it than you can count on it being aggressive, effective, and dirty. I'm assuming that the command squad with Apoth are all on bikes even though you don't list it? List is very fast and with the White Scars all having hit and run, you avid getting tied down in protracted melees.
The only thing I can think that would give you trouble would be massed fire or fast melee units. All your guns are short range so you open yourself to return fire or charges from assault units. The more I read about armies in 6th, the more I think you can't have it all. There will always be a list that can counter yours. You just have to build a list you would want to play and mitigate the risks.
Overall, solid list. Fast, scoring, hard hitting.