In the DVD times I had only Pioneer drives but had to switch to LG to read 4k discs. However, burning quality with non-Pioneer drives was always quite bad (Liteon, NEC etc.). The LG BD drives are OK for single layer discs (BD25) but repeatedly create eroors at the layer break of BD-50 discs. No matter if you have the best quality discs to burn. Only the Pioneers can handle the layer break w/o issues but you also need to turn down writing speed. The BD-50 and larger specs are just not taking into account that most discs have quality issues at the outer edge. For DVDs you could decide when the drives stops at the first layer and switches to the second one to avoid issues at the outer edge. The BD spec doesn't have it. The burner has to burn to the maximum capacity of the first layer and is only then allowed to switch to the second layer. This is crazy because from the very beginning of multi-layer discs most had quality issues at the outer edge of any layer. Somebody just decided this w/o looking at the historic issues.
Thanks for the insights.
My LGBU40N (albeit bought to back up my original UHD discs) does burn the dual layer 50GB BD-Rs well enough that I have a 7 for 7 success rate with Philips discs (out of a batch of 10) which I bought based on reviews (CMC MID). 5 were burned at 6X! I reduced the last two to 4X since I was done testing at that point and wanted to hopefully improve quality.
They play in my stand alone BD player.
The HP 50GB discs I bought (which have a Verbatim MID) are much worse: 3 failed burns out of 7 so far (also from a 10 pack spindle which I bought for testing).
That being said I am considering getting a Pioneer (as noted above) for burning (assuming it will improve disc longevity) and keep the Archgon / LG BU40N for 4K ripping only.