Couple of comments.
IMHO this system is of much less use than it might be as it doesn't seem to allow archiving of notes. Numerical scores are for insecure amateurs. The ability to add even a line or two of textual commentary would be far more valuable.
Second, my usual objection to ANY web based cellar management system like this.
Go ahead - invest the hours it will take you to enter your cellar data.
a) the designer/operator loses interest/ walks under a bus
b) they suddenly decide to start charging a fee for the formerly free service (or sell to someone that does)
is there a feature that allows you to download all of the program and content to operate the cellar on your own PC?
If not, it is tantamount to laying your naked 'nads in the owner's hand, trusting that his nice smile means he won't squeeze.....