https://www.techpowerup.com/274136/arctic-announces-the-liquid-freezer-ii-420-aio-liquid-cpu-cooler
 
Arctic today expanded its Liquid Freezer II line of all-in-one, closed-loop, liquid CPU coolers, with its largest variant—Liquid Freezer II 420. This cooler uses a 38 mm-thick 420 mm x 140 mm radiator, which is ventilated by a trio of 140 mm fans, with the coolant pressure of the pump-block adjusted to match the large radiator. The pump-block features a tiny 40 mm fan that spins between 1,000-3,000 RPM, to maintain airflow near the CPU VRM area. The pump's impeller does 800 to 2,000 RPM. Among the CPU socket types supported are LGA1200, AM4, LGA115x, and LGA2066 (no sTR4/sTRX4 support). Arctic includes three Arctic P14 PWM fans, which feature fluid-dynamic bearings, spin between 200 to 1,700 RPM, pushing 72.8 CFM of air, each. Available now, the Liquid Freezer II 420 is priced at 120€ (including VAT).
 
A 420mm AIO cooler for 120 Euros is a very good price. 
 

aka_STEVE_b
I almost bought the smaller version of this one , but was reading how the mounting was wonky.
I wonder if it has been corrected ?, .. or improved any .?

As of 10/21, it hasn't been modified, but it will be.  Probably much easier to mount the backplate using electrical tape to hold it while starting the first screw.  (MB outside of case, of course), then remove the tape after you got it going.  One time deal, so can't complain too much for the price / performance I've seen reviews on (particularly Steve from GN). 

I like the fact they have a built-in flow meter into these AIOs.