I have been using Synology 2413+ for 2-3 years now and i agree that they have good support and products.
I have also seen some smaller qnaps in action and heard not complaints from users.
Qnaps have a great website with useful information as well as a larger products range, especially higher-end.
To compare similar products i am using Synology's DS3615xs against Qnaps TVS-1282T.
Yes, there is a few hundred bucks gap between the two devices but i must admit that i am favoring the newer Qnap product.
Qnap: comes with 2x10gb, 2x direct HDMI, i5-6500 3.6 GHz,16 GB DDR4, SSD.
Synology: 1gb, 10gb optional , Intel Core i3-4130 3.4 GHZ, 4GB DDR3
Hard to look away from those features.