I've never flown one but I've always thought it was a nice design. Does it fly well as a diamond with the tail? Being able to remove the tail and play with it as a fighter is a bonus, I wouldn't expect that design to be too radically quick as a fighter so it should be a good introduction to that type of flying. And learning some fighter skills opens the door to the new no wind SLK's that have become so popular. I think it's a great choice and expect you'll enjoy it.
When you're looking to step up the soon to be released Prism Switch
might be a logical choice. It will also fly as a single line kite like your current model and
does double duty as an introduction to dual line flying without breaking the bank.
Another soon to be released Prism kite the Zero G
will fullfill you needs for a low wind / no wind kite. I've yet to see one in person but I'm wondering if by adding a tail it might transition into a low wind SLK too that you could stake out and have a picnic.
It really is a good time to be a beginning kite flyer, these 3 models open the door to 4 different aspects of kiting without breaking the bank and if you progress on up they'll stay in your bag for years to just put a little color in the sky while flying other kites or for a casual day in the park or on the beach.