I find them scummy. It seems like they are practically scouring IST and constantly refreshing their page to see if something goes out of stock so they can up their price. Honestly, I know its more likely that they also get inside info since they are a seller, so it's probably a coincidence. But what i have noticed is that a book on my IST wishlist will become unavailable and when I check CGN they have raised their price. Again, they probably just know that it is going out of print because they're also a store, but raising the price like that, I don't know, I just find it to be scummy. I have an ebay seller I use frequently that is usually good and priced well but they do the same thing. Maybe I'm just being dumb, but it rubs me the wrong way.
I also read something online once claiming that a guy was at their store and overheard Max, which is who I've dealt with at CGN, telling another employee that a certain omnibus was going out of print in the very near future so they could finally jack up the price and the copies they had been holding in the back and finally make some "real money". I say this fully acknowledging that I did not witness this so the person that made this post could absolutely be lying, but just with stuff I have witness and stuff I've read online, it doesn't paint a great picture so I only use them as a last resort.
And all that said, when I have ordered from them, I don't believe I've ever had an issue with packaging or book arriving in proper condition.