+1 Potawie...
you know, I don't like them for the reasons listed above, dry out too quick, stay too wet, messing with the netting, etc...
so...I have chosen to use a simple soiless seed starting mix in 72 cell starter trays and have had great success with it...
another thing I don't like is the moisture inside the domes...if I have to buy trays with the domes, I throw the domes away...I had the moisture buildup...IMO that promotes damping off because of the environment being too wet...this is JMHO...
but, as has been said, it is whatever works for you...
I will say that if I only planted a few seeds, I may use them but when I plant thousands of seeds a year, it gets expensive and I don't have time to mess with them...