Yes!
Personally, I think that you are better off with any other lube then Maru. Although Maru can speed up the cube for a bit right after applying it, it only lasts for so long before more is needed. But with any of the "Modern" lube such as DNM-37, Lubical Black, Martian, Galaxy, and even Traxxas 10-50k, those are all much better than Maru.
Additionally, Although most of the lubes mentioned above are a little more expensive then Maru for the amount in the bottle, they are worth the couple extra dollars, and they last much longer in the cube then Maru, plus you only need a couple of drops of lube in the cube, so even a small bottle will last a while. The only lube I think that compares to Maru (in quantity of lube for the price) is the Traxxas lubes. I got a large bottle of the 50k 3 years ago and I still have about half a bottle left, and I say that because the 50k is pretty thick and you only need a very small amount of it in the cube to speed it up, and even with a small amount, it will last forever.
Personally now I use the Traxxas for the core and SCS Martian for the pieces most of the time, but for certain cube or if I want a different feeling I will use the Traxxas 50k for the whole cube.
I hope this helps, but please ask more questions as you have them.