I think you should get an solid wood stand if it makes you feel more comfortable, however, I have to say that I had a SeaClear 55 show tank on a particle board stand for 5 years w/ no issues, and I am sure Oceanic normally puts out a quality product, MDF is sterner stuff in all things but water, and if I am correct, that MDF stand is actually covered in a plasticized coating.
All that being said, there is nothing like a solid wood stand, i hated that plasticized black stand for my seaclear tank from the day I bought it, I was just to cheap to replace it.
Good luck, and let us know how it all turns out.
"Maybe in order to understand mankind, we have to look at the word itself: "Mankind". Basically, it's made up of two separate words - "mank" and "ind". What do these words mean ? It's a mystery, and that's why so is mankind." ~ Jack Handey