If you really like zucchini noodles, I think it's worth it. For me it's the only way I can have spaghetti so I love it, plus I trick my kids into eating vegetables with it. I go through phases of making zucchini noodles (mainly b/c we are in transition right now with selling our house so keeping the house clean and cooking was hard to do) so I haven't used it for other vegetables yet, but I think it's work great. If you eat RAW then I think it would be an excellent addition b/c you can slice all those vegetables and fruits thin for dehydrating, etc
For me, I wouldn't ever make them if I had to use the julienne peeler b/c I don't want to be in the kitchen longer than I have too but you might be different and enjoy food prep.
I've regretted purchasing some kitchen gadgets (like a wok), but not that one
I plan to use it more in the future when life settles down and I can focus more on cooking.
I steam them in a frying pan with a little water until soft and then make spaghetti b/c the tomato sauce hides the color (for the kids)