does anyone have both the sirui k30x and k40x?

Hi folks
I have been kind of intrigued by the sirui k 30x or 40x
not sure which one to get
th difference monetarily is about $40 - which is no big deal
and both can hold my small amount of kit
my question is one of materials
has anyone had both? can you say that one is made better than the other?
Is the 40x THAT much bigger than the 30x?
thanks

Don't own them both (just the 30), but have seen them both. Workmanship & materials seemed the same to me. 44mm vice 54mm and the 40 weighs about 0.4 pounds more than the 30 (and supports a greater load).

The Canadian site is easy to use for a spec comparison (direct link to 30, but can click on 40 from same page).

thanks so much for the link - it kind of does put into a context
appreciated!