Glass is a pretty hard material for sex toys. If you are gentle, you can learn to safely use a glass toy by listening to your body. You can use any type of lube with a glass toy.
I wouldn't suggest this type of toy for the beginner, only because this is such a great product you don't want to skip more beginner textures. But, if you're an adventurous kind, have a blast!
I've wanted to try a juicer type toy for a while now, totally worth the wait. For a use on a guy, just remember which way you're rotating this toy. If you're squeamish about santorum, you'll want to turn it clockwise.
The tip is slightly more pointed than the average glass toy with 6 grooves that start just below the tip and go about ½ inch or so. Just under the head, which is slightly larger than the shaft, there is a 3 tiered blue spiral that either draws out or takes in liquids (depending on how you turn it). On top side of the base are six nubs that align with the grooves at the tip. These provide stimulation to the outside of whichever hole you're playing with.
I've got pretty average guy hands and the overall length is about most of my hand (about 5 1/2" or so). This was the perfect length for p-spotting for me. The knob at the bottom was also a great stabilizer when used for p-spotting.
The Blue Spiral has made my wait for a juicer-type toy worth it. It was a little awkward to use by myself, but I can't wait to use it on my female partner to get her take on it. The awkward part of the Blue Spiral was the small knob used for turning; it was about 1/2 too short to really use by myself.
Glass is easy to clean: soap and warm water. Let it air dry on a rack of some kind and then return it to the padded bag it comes in.
You can use ANY type of lube with the Blue Spiral.
This has to be one of the most discreet toys I've ever had sent to me. It came in the usual mundane USPS box, covered in packing paper, and packed away in a purple storage pouch in a plastic bag sealed with a bar code sticker. If someone peeked at it in the box without touching it, they'd just see the pouch with maybe a little bulge for the toy.
Even if you don't use this as a juicer all the time, it is a great plug with simple but effective texture.
The Blue Spiral introduced me to juicer toys first hand. It also taught me something else, juicer toys are great prep for larger toys. After about 10 minutes of being a crank-yanker, I tried the large end of this toy. Normally this would be way too big to try this early in a session; but not this time!