Great upgrade. Affordable and solid. [SEP] I got this from Amazon Warehouse, where it was open box but supposedly unused. I don't know if that was true, but the condition of my item is irrelevant to the review. This is a great light. It replaces both my 24w UV bulb lamp and my 9w LED UV lamp.<br /><br />This thing cures Gelish and RCM so fast, and my manis are lasting so much longer without lifting or chipping. Most of the time now, I get bored or my nails grow too much before the polish even shows a hint of coming off. The LED placement is great, and it cures all 5 fingers at once with no trouble. There is a bit of heat, but it's minimal and I'd be surprised if anyone found it painful. I haven't tried the 99s low heat mode.<br /><br />The sensor feature is nice. I was under the impression that I could set the timer to 30s or 60s once and forget it, but so far it seems like I have to choose a time every time. If not, it goes on until you remove your hand. I haven't gone over 105 seconds, so I'm not sure how long it would go for, but it definitely doesn't have a default shut off of 99s as advertised. My open box didn't include a user manual. I'm hoping to find one online.<br /><br />The white of this model doesn't reflect as much light as those lined in silver. But it still leaks a fair amount of light. I'd definitely advise using glasses or averting your eyes. And make sure to keep kids away, because even the reflected light can be painfully intense.<br /><br />It comes off the base for doing pedicures, and while the magnetic components seem to work well and the pieces fit together nicely, I don't polish my toes so I don't use this without the base.