Basically，this is a good deal with this price. However, there are still some items that need to be improved.
The manual is too simple. No procedure indicated and photos are not clear. It is very difficult to connect the air tubes after having the armrest installed. ( should connect on them beforehand).
Delivery is 2 days delayed but acceptable.
We don't know there are 3 boxes for this product. Better indicate on the order.
One box (I found it was #3 afterward. No indicated on the box) delivered 1 day late.
I nearly called the customer service for missing items.
Another 2 boxes (should be #1 and #2) came 2 days late.
Then, I found the manual in Box #1 and knew there are totally 3 boxes.