Hey Mike,
I think the biggest thing to keep in mind is that Meguiar's products are designed to work together. As such, topping D151 with M21 will indeed be just fine as the products are compatible with one another. However, that may not be the case with other manufacturer's products!
I am sure I said it somewhere in the 25 pages how I used the D151 as that question does come up a lot. The reason I topped the D151 is that I wanted a more durable LSP. While I have tested the D151 on its own and it did very well, I still wanted something a bit more durable as well as the look I was after.



Tim
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