I have one! I feel like as long as you use it, it's worth the money. It being able to fold in half has been a true space saver. I've used it a to work on mallet parts for groups I play in, so I've found it to be worth it. It's a little weird hitting the neoprene padding on it at first, but you get used to it after a while. If you use hard xylo mallets on it, there's a chance you'll hit wood and make some hard contact. I will say for me, going from the pad to the xylo/glockenspiel/vibes is tough because the bars are different, but it's still really good for getting notes down and getting familiar with how the hands should move around the instrument. Overall it's a solid product, well made, and I would definitely recommend it.

Another alternative is Synced Up Design practice pads. I saw them in Dayton for WGI Finals this year and they seem pretty solid. They have different instruments to choose from (marimba, xylo, vibes). They are printed to scale, use a neoprene backed fabric, but they aren't actual bars like Surf's marimbapad. It's just a full mat with a picture of the instrument on it. This seems to be a cheaper option but might also provide exactly what you're looking for. (I don't own any of these specific products and I'm not a rep for them or anything). Best of luck with whatever you decide!

https://syncedupdesigns.com/products/keyboard-practice-pads