My background: I have HORRIBLE eyesight. I wore glasses since I was 8 years old until about 14. My eyesight got worst every year in the interval. Around 14, I started wearing regular contact lenses, and that's also when my eyesight started stabilizing. So I guess I've worn regular contact lenses for about 7 years.
Why I decided to buy circle lenses: Honestly, I had no idea what circle lenses were until I did a little more research online. I've always wanted to try color contact lenses, but they were too expensive for me. I was a bit wary about buying contact lenses online from two girls, but I've found from experience and other reviews that the girls at Mesmerized eyes are very reliable and the lenses are authentic. I bought the lenses mostly for the colors, but I guess the added enlargement is a plus too.
Regular contacts vs. Circle Lenses vs. colored contacts: Circle lenses make your iris bigger, therefore making the person appear more "doll-like" because the eyes look bigger. Regular contacts are just clear. Colored contacts are similar to circle lenses in that it might have different colors to enhance the eyes, with the exception of the outer dark ring to make the eyes look bigger.
Buying circle lenses: I honestly do not recommend buying circle lenses if you have not seen the optometrist and had a proper eye exam for contact lenses. I bought the lenses because I knew my prescription for contacts (which is completely different from the prescription for a pair of glasses because the contact lens includes the base curve and diameter of the lens). Even so, I am still in some danger because each contact brand is different, thus might require a different prescription. However, I limit the time I wear circle lenses and hopefully that limits the risk I am taking.
Not to sound all parental and authoritative, but I think the health of your eyes is more important than the beauty of it. It is VERY easy to develop eye infections of the contact is handled or clean improperly, and improper lenses can also damage the eye.
Geo Lens general comfort: This comparison is generalized to all the Geo Lenses I've tried, and compared to my regular contact lens which, to me, is a 10/10. I think this is just me, but I can't wear Geo Lenses for an extended amount of time (in 5 hours it gets uncomfortable, 8 hours is max but by then my eyes are starving for oxygen). I suspect this is probably due to the percentage of water in comparison to my regular lenses. Geo Lenses are 38% water versus my regular lenses are 60% water. More water = more permeable = more oxygen flow. The geo lenses are also thicker, probably because they have an extra layer for color. However, I searched all over for reviews before purchasing and it seems that most people find them even more comfortable then their current lenses, and those who never wore contact lenses before also found them extremely comfortable. But overall, I wouldn't wear geo lenses all day because they are uncomfortable for me. Remember, everyone is different so it might be different for you.