If I were you, I would buy it in a heartbeat. I have been eyeing up that table since I saw one at someone else's; it seemed really nice and sturdy.
I currently have my machine on an adjustable-height Ikea table, and I love it. Honestly, sometimes moving it up or down half an inch relieves a pain that's been developing. You can't get that "perfect height" with a fixed height table, especially if perfect changes from day to day (or even morning to night). I'm fairly young and in good shape; I can't imagine sewing without it when I'm older.
If you can afford it, go for it! It sounds like you've thought it through, and it seems like a good solution.