I can not speak of the Tie Fighter but I did get the 1/24 B-Wing from them. They delivered it in a timely manner. They also sent parts out later at my request for ones that were missing from the original shipment.
The casting on my B-Wing kit is not great but it is a lot better than some kits that I have received by others in the past. The B-Wing kit I received will take a little extra time for me to get it where it needs to be. Last I knew, the B-Wing is not available as it is being retooled.
I have seen finished builds of the Vader Tie Fighter and they look amazing. I would love to get one some day. The only complaint I can remember reading are that the wings can be a pain to get angled/aligned just right.
If you get the kit, please post a work in progress thread as I would love to see it.
The attached photo is from Korbanth Sabers site when the B-Wing kit was still available for sale.