The choice to purchase is for extendable and has shelves. The size of the dining table is good with our small dining room. 
The instruction is bad. Only provided by pictures so it took quite long to figure out and looks easy but it was not. The wood is made of particle wood and chipping along the way when we installed. We were careful and still cannot avoid the chipping wood around the bolt. Luckily they are inside part. The surface table has small chipping when we got it.
Overall, I think the price is a bit too high for the quality we get. But it ticks the functional table that we can extend to 8 seats if necessary and the end result looks not bad. Instruction should be more clear with explanations to avoid mistakes. I hope it will last long.