They're sweet. There's no doubt about that. But WAY too much money at $4.76 AN INCH.
To, beyond ice the cake, it's only 6 1/2" in width. Meaning it's really only good for nanos and narrow tanks like the 55 gallon. Unless you want to switch their orientation and have three or four separate heatsinks to mount/hang/wire together. Which defeats the whole purpose of them being sleek and "all-inclusive".