Hi Unicorn,
Welcome aboard! As with most products, some will like them, some not so much. "Ostomates" covers a very wide range of people that have an ostomy for any number of reasons, so how a product performs depends on what sub-group of ostomate you are. Blanket recommendations for a product by everyone with a stoma are pretty far and few between... and for good reason. There's also a myriad of products out there to make our lives better, but few actually do. It's like everything else... you have to try things for yourself and see what works for you. Going by recommendations for specific products is only valid if the people giving the recommendations are in the exact same situation you're in. Of course, it never hurts to ask, but just don't hang too much credibility on recommendations from others unless you know their specific situation.
I checked out StomaDome and I guess it's a maybe. Depends on what your output is like and if you really want another bump showing under your shirt. Do you really need a guard for your stoma? I guess some do... and some don't. Depends on your situation, as I said previously. If you NEED one... it's probably a game changer. If you don't really need it... probably more a pain in the ass than a help.
Nu-Hope is a top-notch company. I haven't heard too many complaints about anything they make, and their phone support is excellent. They can be pricey, but that's relative to how bad you need it. Some folks on here simply make their own stoma belts, guards, etc., and it's not hard to do if you're the DIY type.
I'd suggest to you (and everyone else) that's looking for a product recommendation... or just feedback... to be very specific about what the problem is they want the product to solve. That way, people with the same issue who've tried things to remedy that can give you some really good feedback, rather than letting the peanut gallery give you opinions that may or may not address your specific problem, but rather theirs.
;O)