Yes, it is worth it!
It lasts a long time, actually dries fast without a drippy mess, doesn't get mushy like a regular cardboard box, takes up little space, can be easily packed. Is it a necessity--no. But I was constantly cleaning up spray from my table and and going through cardboard. And for $3.50-5.00 (depending on whether you use a sale or coupon to buy it), I highly recommend it. I use my mists much more now--easy to set up, no clean up required.