Besides being just plain pretty, I got the blue ones, the size (2" long by 4" at its widest diameter and weight (.6 lbs) of these eggs is what attracted me to them most. I tend to use these more for pleasure enhancing rather than Kegal exercising. I think they complement thin shaft vibrators with great rabbits. I was anxious to experience newer sensations and thought these would certainly complement a vibrator, I was absolutely right! The biggest plus for these is that there is absolutely no way you need the often awkward retrieval cord. Though as an experienced user of other Kegal devices I can easily retrieve any balls/egg Kegal exercisers anyway without a "rip cord." I don't always use the harness with the Luna Beads and don't need to.

I tend to instead use the Luna Beads or Smart Balls for exercising because they stay in a little easier. While walking or doing chores around the house these don't slip out quite as easily. Okay, so my Kegals aren't in the best shape, but these eggs are fun at play time. I just love the feel of them rolling about as a result of a vibrator within me.

Having already tried other various Kegal exercisers I can say these provide quite an interesting sensation and have included a picture comparing the similar eggs/balls I've used.
The Luna Pleasure Bead System
NS Novelties Clear/Pink Crystal premium glass eggs – vaginal balls
Fun Factory Smart Balls Teneo in purple
Gold Ben Wa balls bought years ago

The eggs insert very easily even without lube. I don't use lube if I do use them for Kegal exercising, because then they would indeed slip out too easily as a result if I was to walk around. The tear drop shape makes it so much easier to slip them in than the standard round ones. If necessary I would just use a little Personal Moisturizer to aid in inserting them, not much is needed at all.

I've never tried temperature play, but feel this will be my next step with these fabulous eggs. I enjoy my toys immensely, we women know what turns us on the best. I was at first apprehensive approaching my husband, who by the way doesn't mind them at all during intercourse. They feel great with a partner either using the mini column cushion raising my back up higher or doggy style, the sensation of them is quite stimulating. My next update on these will include my experience with both warmth and cold.

I love that these come with a storage bag included in the box and are so attractively displayed through the box's open window, yet very secure in the clear molded plastic form fitting protective packing. They will be so easy to travel with and will fit nicely in my toy travel bag allowing me carry my Kegal exercisers/ pleasure enhancements easily all at once with my other vacation toys.

Careful inspection of the eggs is important as with any glass product when first receiving it. You will want to check for any defects, cracks or bubbles of air especially near the surface. My blue ones were smooth and absent of any defects.
As always with any toy, cleanliness before pleasure.
I favor the Eden Fantasy's wipes, but after use always soak them in hot tap water a few minutes followed by gentle scrubbing with a clear antibacterial cleanser and thorough drying before returning to their storage bag.
Before use, I always like to give them a once over with either the toy cleaner spray or the wipes, depending how many toys I'm using during that pleasure moment.

While I am still strengthening my Kegals, these are useful for that added 'full' feeling and movement within when using an internal and/or external vibrator or dildo, as well as during sex. Though I would suggest anything but a glass dildo with glass eggs. I use mine frequently with my Vr6.5 which is has small enough shaft to fit both the eggs and it. Using it in this manner makes up for the narrow girth of of the shaft plus adds additional vibrations to the eggs within. Of course the additional vibrations do result in added noise level and this is why I rated them at 2 Bees.

These are one of my favorites now, especially in tandem with other vibrating toys. I've been experimenting with temperature play with the Ultra Heat and Ultra Chill lubricants. So far, I've found the heat works best for me, and use them as additional stimulation.