I recently bought a LUC4, and to be honest I am very happy with the purchase. It's been a great charger.
While I was waiting for it to arrive, I was watching video reviews and doing more research to learn as much as I could about it when I found what looks to be the holy grail of battery chargers. It's not a charger we usually talk about here in the Vaping world, as we normally stick to the Nitecore/Xtar/Pila/Efest norms, but this charger is regarded highly in other communities and after watching some videos and looking at test results, this thing is just ridiculously good.
It is the Opus BT-C3400
It can charge, discharge, analyze, test, and recondition dang near all types of rechargeable batteries from Ni-MH, Ni-CD, and Lithium... It can aute sense the type of battery you put in, has a multitude of charge currents, every channel is fully independent (meaning you can truly set the charge current separately for each channel individually)... It's just awesome.
Big drawback is, it has a cooling fan... A little one... And it can make some noise... Like a laptop fan on full speed ahead. It screams like a little banshee if it's getting too hot.
Amazon.com: BT-C3400 Universal Battery Charger Analyzer Tester for Li-ion NiMH NiCd rechargeable batteries: Electronics
Here is a video review on Youtube:
https://www.youtube.com/watch?v=jlYPANszmv0
It's a long watch, but they really run this thing through it's paces and do some good testing. It's for the older model, the BT-C3100. The Amazon link is for the upgraded version