hikmer,
I've seen pics of the ML 532H, the most revealing were with the lid popped off. Internal heat sinks don't seem like the best idea (glad you brought it up) and it's built on a "one size fits all" chassis. The obvious reason is a cost saving measure. More models on a single chassis is kinda what GM did with their cars about a decade ago. It is on my short list to buy, but I the checkbook won't come out unless I have concrete assurance that it could be returned. I've had buyer's remorse with new, that risk is elevated with used.