Those are nice - some of the best crystal glass in the business IMO. The thing about Peltier bananas and vanes is not so much their number as their "plumpness". If vanes start getting thin and they are separating lengthwise at the core, it might be wise to consider other possible manufacturers.
Myself, I like my Peltier Bananas fat and with fewer vanes - the bigger the better. But of course, that's just me. π