If you are a player who keeps your cab in a van or whatever, and typically plays bar/club type gigs that have close parking and easy access, then the whole lightweight thing is not that big of a deal. A heavy cab, regardless of castor design, etc., will never by 'easier to schlepp' than a lighter cab on castors or whatever, but the difference could very well be trivial.
On the other hand, freelancing in large venues withouth ever having a bandmates help with the schlep or even with lifting the cab up on a 4 foot high stage, lightweight can literally be a life changing experience.
Playing bars with a band that does 'band load ins'... forget about it... buy what sounds good to you at the best price. If it weighs 100 pounds, who cares
