Review (3/5): Works great, but... (read to end for final update)
It's too soon for me to tell if this is really working but the surface of my nails looks better.
The problem I have is with the applicator. They use a lip gloss applicator and the fuzz started coming off the first time I used it. I am now using bare plastic to apply it. (just ordered some eyeliner wands to replace...hope they fit the tube)
GONNA JUMP IN HERE WITH MY LATEST UPDATE IN CASE YOU'RE TEMPTED TO STOP READING. Still love this product and....YAAAYYYYY....my latest (direct) order has BRUSHES instead of foam/fuzz things on the wands. They earned a fifth star for this. So happy!
UPDATE: Three months later and all the peeling areas on my nails are gone. I've had no more splitting and my nails are definitely stronger (I insist on using them inappropriately sometimes and they no longer show signs of wear and tear at their tips.)
I think the people upset with lack of progress are either not using the product as recommended (twice a day) or just aren't waiting enough time. This is not an overnight fix or a magic "blink and your nails will be longer" elixir. Your nails need to grow normally but, being stronger, will attain length without breaking.
NOTE: I file my nails daily (in one direction) with a fine glass file to make sure there are no rough edges from day to day. I've done this for years, though...it's not the reason my nails are so much better now.
Expensive? Yes. Worth it? Absolutely.
FINAL UPDATE: Since I also use a cuticle oil that supposedly has strengthening properties, I decided to ask the Rejuvica people two questions (separate customer service representatives). This product does NOT penetrate the nail...it stays on the surface. And if you wash your hands, the product washes off. I'm going to stop using this product when it runs out. If my nails suffer, I'll go back to using it but put some kind of protective wax product over it immediately. If my nails continue to look good, I'll just stick with my cuticle oil (Barefoot Scientist).