I tried Schwarzkopf Root Retoucher this weekend and the results were so-so. I'm a medium-to-dark blonde and while the shade I chose wasn't an exact match (my fault as I chose a shade that matched my natural colour rather than my highlighted colour), it did blend well. Unfortunately, I think the products is meant for grey roots, not darker roots and (knock-on-wood!), I'm not at that stage quite yet!
That said, the Schwarzkopf Root Retoucher is a nice size and good value for the price so I do recommend it for those looking for a product for this purpose. The colours are easy to match to your own hair and I like that the spray nozzle has a spout as it makes it easier to get the exact area that needs coverage.
When I tried this product on my own hair, I noticed it dried quickly and most importantly did not come off on my clothing or my pillow case. I would definitely #tryrootretoucher by @schwarzkopf again, next time in a lighter shade!
I received this product for free from Schwarzkopf in exchange for my honest review.