I got an email today from Harriet Hargrave. See below.
Hi Kat,
I don't know that this table will hold up with a really heavy machine sewing at higher speeds. It is an excellent height and a good size for sewing. I would suggest that you talk to your husband or someone that has handyman capabilities and see if there is a way to add more support to the tray if you are worried about it. There is not going to be a perfect table at a really low cost to fit everyone's needs. I haven't heard anything negative from anyone, so that is what I have to go on. You might want to search out something else that might fit your needs better. There is a lot of products out there that I don't know about. Good luck in your search.
Harriet
My Husband is still going to reinforce it for me (someday) and in the meantime, I am using a lighter machine with it and it is working out wonderfully. It was great to hear back from Harriet.