While the AlphaCool M.2 heatsink looks neat, stealth, cool, and like a nice way to keep a drive cool while maintaining use of the M.2 slot and clearance for PCI-e cards above it, there are some drives that it would not sufficiently cool.
Take a look
here at a KryoM.2 review. They test a 950 Pro in 1) a bare drive in a PCI-e add in card, 2) The same card with the heatsink it comes with, and 3) a KryoM.2
The heatsink on their cheap add-in card looks like it has more thermal mass than the AlphaCool M.2 heatsink setup, yet still fails to sufficiently cool a 950 Pro in their testing. A 950 pro is definitely not the hottest M.2 drive out there, the RD400A and M8PE beat it out by quite a lot. I think the AlphaCool heatsink might be sufficient for a 960 Pro or Evo as they run quite a lot cooler than the 950 Pro did, but for any old hot M.2 drive it wouldn't fully alleviate the symptoms of heat.
For science! And because I ordered a 960 Evo 1TB (and the AlphaCool thing is in stock now) I'm going to order one and get some details about how hot the drive is before and after installing, which could be compared to the KryoM.2 I have a 960 Pro in as I believe they should run similar temperatures with the same controller. (They are different versions of the same controller, so I expect some difference will be had but I think the temperature delta will be comparable between the two.)
Edit: As for the OP, you could throw together a quick fix like I did originally before I discovered better boutique cooling products for M.2 drives - I bought some 15mmx15mm heatsinks and 0.8mm thermal adhesive pad and stuck a heatsink directly on the drive controller like this:
If there was an easy way to ship you a tiny heatsink (obviously won't fit in a standard envelope) I would send you one and a thermal adhesive pad to attach it. You can only buy a pad too big (cut to size) and heatsinks in a 6, 8, or 10 pack so I have lots of extras.