My 1588 has the yellow rails. My Incuview has the rolling side to side. I've been happy with both kinds. Rails is nice, but I worry about the turkey eggs barely fitting, and since I don't have quail rails, when I hatched quail, I did them in the Incuview the whole time. Yeah, they got turned every which way, but it worked out fine.@Finnie which turner do you have for the 1588? I see that theres the up & down option or the rolling side to side one. (looking at incubator warehouse website)