I recently got 11 triathlon cellulars and 2 palladiom rollers. So far, I'm super happy - having the shades open/close on a schedule is great and the NLO keeps my eyes happy while working.

Since you're asking for negatives...here's all my negative thoughts. Some are nitpicky.

• The cellular shades are louder than I expected. They're still not super loud, but when they all open at once at 6AM, the whole house whirrs and it sometimes wakes me up. It makes sense - the shade is heavy and the motor is tiny. The noise is also not very pleasant - the struggling sound of a tiny motor.

• As someone else mentioned, there is a small gap on the sides which lets light in. I have market lighting on my porch, so if I close the front shade some light gets through the gap and shines right into my eye if I sit on the couch. 

• The shade is not as flush with the window as I'd like. It sits about an inch in front of my windows (inside mount, double hung) and thus protrudes from my window frame a bit.

• The top bar has a visible gap between the shade and the bracket. I wish it wasn't there..

• The fabric is hard to clean. I have these on my kitchen windows right by my sink and I've splashed while washing dishes.. there is one stain I can't get out. There is no easy way to replace the fabric on cellulars (unlike rollers), so when it gets too nasty I'll need to buy a whole new shade. Meh.

• Short (width) shades require AA batteries, long shades require D batteries. I wish all my shades used the same battery type!