I have used KP184 as load for higher power (400W or 40A) devices. CC, CV, CR, CP modes work, user interface is pretty clear. Unit performs well, I am satisfied. Under load fan increases speed smoothly, but is newer loud. It can handle 400W for long periods no problem, cooling is fine. One time it went into overpower protection, turn-on/off reset that (high power PSU was connected and I approached max power with V*I).
Few points of concern - back screws are connected to (+), isolate those with tape. Inside I would recommend to isolate heatsink from case with tape. Also, scrape paint on metal case near screws to get grounding connection.
On/off switch can be routed to front panel, as by default it is on back panel.
There are few threads on KP184 on the forum, search around - generally good impressions, drawback is small ripple current (of ~10mA order) with lower loads. For 40A use that doesn't matter.
KP184 has great value for money. ET5410 and DCL6104 have almost the same construction (not a copy, but different implementation) with similar features and slightly higher cost, but have LCD display instead on 7-segment LED. With your requirements, mostly >=40A, other options starts at 3-4x price.