In the "don't need one right now, just doing my research" department...

There's a new RPi 4 out there, announced in June, and this is a pretty good and balanced review:
https://www.techrepublic.com/article/raspberry-pi-4-model-b-review-this-board-really-can-replace-your-pc/

Direct comparison to the previous RPi 3:
https://www.androidcentral.com/raspberry-pi-4-vs-raspberry-pi-3

As always with the Pi, there's the hype and reality:

• Element14 (Newark) the official distributor is waiting for stock for the 4 GB version. They sell it at the official MSRP of $55 (+ s/h) bare-bones.
• Amazon: Can't find a bare-bone one, but there are kits for the 4 GB version (with power supply, etc) for $99 (also waiting for stock). (example 1 and example 2 ... these are good kits)

When comparing to "something else", the "kit" price is often a better indicator in my book since we're often comparing it with another mini-PC that has a power supply, storage, and a box. In this respect, it's interesting: years ago I was expecting a full RPi 2 kit to be around $100, and here a full RPi 4 kit is still around $100.

Video review from Andreas [link?]:

• Speed is only 30% marginally faster in tests.
• Can get really hot during intensive computation.
• Ethernet speed is now good.
• Nowhere near a “desktop” computer beside claims.
• Micro HDMI instead of full size HDMI.

Perf benchmark:
https://core-electronics.com.au/tutorials/raspberry-pi-4-vs-3-model-b-performance-benchmark.html

The dual HDMI output can be a good solution for building e.g. a public display.