Pioneer DVR-K15 & DVR-K05 questions?

I’m thinking about replacing the lousy optical drive in my Asus Laptop with the Pioneer DVR-K15 or DVR-K05 (slot load version).

Could the folks who already have these drives tell me…

What speed does the drive start off with when reading and writing CD-R’s?
I know the max speed is 24X but what does it start with? 10X? 12X? 16X? Slower?

Also, does the drive work well with Nero?

Thanks in advance for any helpful info.