visited the BRAND NEW West Covina location a couple times since opening..
the layout of the restaurant is similar to that of the Chino Hills location, but slightly bigger (both in the bar and in the dining area). the dining area as a whole seems to be "large party" friendlier than Chino Hills. at C.Hills, there's only about 2 parts of the restaurant that can really be used for a large party.
not holding it against them since it's still new (as well as the staff), but service has been pretty bad.. visited twice since they opened.
first visit (lunch time, around 1pm): i ordered 12 wings and a basket of fries with queso. got my wings, fries never came. i figure ill just finish my wings then ask for the fries so they're still hot. i ask for the basket of (large) fries, and out comes a regular size serving with cajun seasoning rather than queso sauce. i ask what i was being charged for -- waitress says regular, so i go ahead and keep the regular. a friend of mine ordered wings with Mango Hab on the side. she got her plain wings, but no sauce. we had to ask a total of 3 times (waiting about 5-8 minutes between each time) for the Mango Hab sauce. the sauce finally comes out and it's Hot BBQ - the wrong sauce.
second visit (dinner time, as a laker game started): after placing the order, it was taking quite a while for our food to come out. we're not really the type to complain as we have a good time anyway. our waitress came by our table and apologized for the long wait, before we even said anything -- good on her part. i'm guessing something happened with the order/kitchen and our waitress wasn't at fault.
i'll give them about a month till the westco BWW is up to par with my regularly great service at Chino Hills.
but i think i will still favor the Chino Hills location, as both the employees and guests are more "local" rather than in West Covina, where you have a bunch of people from all the surrounding major cities.