Autumn planted onion sets (Japanese onions)

I've been having a look on line for onion sets as the nearest Garden Centre  is miles away and it wouldn't be cost effective to purchase them that way.

As I like to grow quite a few over winter,  1lb (500g) of Senshyu and 1 lb (500g) of reds seemed an appropriate amount.

I have ordered these:-

https://www.onbuy.com/gb/1kg-mixed-autum...~p8115050/

and just wondered whether anyone had dealings with Onbuy as the the free delivery made this sound like a really good deal?