Love love love love! OPI gets a big 'ol fabulicious for this! It's just like getting a gel set but without the thickness or fake nail. I haven't tried CND's Shellac to compare the two but a girl in the salon said she preferred Axxium to Shellac. And it was more expensive.
Best part, the Axxium colors match already existing OPI colors, so you're not trying out whole new color (unless you want to) for your longest lasting manicure ever. I was super glad that I had my SPF 55 in my purse however, because you put your hands under the UV curing light after each layer is applied, so a grand total of four times. I could feel the wrinkles forming on my knuckles. I jsut wish I had been this vigilant about protecting my hand skin since I started getting manis!
Visit http://www.opi.com to check out what colors are available. Axxium is found under the "Hands/Feet" tab.