Lots of Grafmatic Sheet Film Holders are available on ebay, price are 50-70 dollars.
Is where a reason to buy this holder? Is it easy to operate and durable? Should i get this holder instead of 3 regular holders?
Thank you for help!

Advantage: space saved; ease and speed of operation; accuracy in holding film flat.

Disadvantage: cost; necessity to shoot 6 sheets before unloading; fragile septums; weight.

I like them.

If your new to large format, I suggest you wait. There are enough things to learn before you can get a good photograph and feel comfortable with the camera.

The Grafmatics are a bit more difficult to load over a standard holder and if you get frustrated you can bend a septum (what holds the film) and then you'll wonder why some of your pictures aren't in focus.