The most useful thing is that I can create my own templates with different colors for each occasion (birthday vs thank-you).
It's also very fast when creating an account from mobile devices! There are some minor glitches such us not being able to delete all fields at once but overall everything works perfectly fine so far!! So many times we receive small gifts like chocolates which would be perfect if they were personalized because otherwise there isn't much point giving them away since noone will appreciate receiving something without knowing who sent/receiving etc., this solves our problem.