I purchased the Tramontina 6.5 qt. Dutch Oven and the 3 qt. Braiser. I don't know how these compare to other similar priced cast iron products but this is what I found with these.
The enamel finish is not great but not bad for the price. The Dutch Oven had a large, quite obvious, half-inch chip in the enamel. The interior of the lid for the Braiser had a chip of green enamel in it from some other product but was enameled around it. It protrudes prominently. While it is in there securely for now, being enameled over, I imagine with the stresses of heating and cooling, it will eventually chip out exposing the metal. This will rust and expand, chipping out a larger and larger area of the enamel. The pot would be ruined.
I ordered another set. The pot of the Dutch Oven was OK. The casting of the lid was not good, with ripples and variations of thickness. The lid of the Braiser was even worse than the first with imperfections, points of metal, sticking up through the enamel finish. These would of course rust, chipping out the enamel in a progressively larger area.
I mixed and matched the pieces to get the best set and returned the rest. In truth, I was not very happy with the best of the parts, but figured for the price I shouldn't expect too much.
I seasoned the edges of the pots and the lids. I guess these are not enameled because they would eventually chip from putting the heavy lid on and off. While cleaning the drips of oil I caused during the seasoning process I noticed many more defects. Small chips in the enamel around the edges. The dome of one of the lids is way off center with the rim, causing the rim on one side to be twice as wide as the rim on the other side. While the rim on the narrow side is still wide enough to sit on the edge of the pot, it is just barely. I don't know how you cast something that poorly. On the rims of the lids are numerous bumps and ridges that will cause the lid to sit up off of the pot and not to seat and seal properly. I've been fileing these down. Quite a task.
The best you could say about the quality of the casting is that it is mediocre. The overall quality control during the manufacturing process and before final shipment appears to be non-existent. You get what you get.
I no longer think this product is worth the price. There are too many defects to expect them to last for years even though they are cast iron. If you care about the quality of the things you have, these are simply not something you would want in your home.