I installed one of the 500GB drives several days ago, and the performance improvement is incredible. Boot times are under a quarter what they used to be with the 5400RPM drive that came with the laptop (a 2011 Macbook Pro). Application launches are virtually instantaneous. It's like a new computer.
I can't speak to the abstract "overall performance" measurements from the article (random 4K response times? give me a break)--where this drive soars is in real-world, day-to-day performance, and the improvements are phenomenal.
Repeated writes are a weak spot for SSD, and this is where a hybrid drive should offer more reliability: cache the frequently-accessed, less-frequently changed data. Should the SSD fail, the drive will fall back to the platter.
The value proposition of these drives is unbeatable--vastly improved speed, great storage capacity, dirt-cheap prices. Let's hope the long-term reliability is what it should be.