Just got my 2510a. I have two Pioneers, an A04 and A06. I’ve been using mostly the A06 with Ritek g04 media at 4x. I’ve been satisfied with the burns, but decided to investigate the NEC.
I immediately upgraded to the 2.06 firmware (unmodded). I wasn’t expecting much, but to my surprise it does burn my g04’s and my cheapo Sonics better than my A06. Attached is a g04 scan burned in my 2510a at 4x.