Like many others I'm an "improving golfer" with a fair amount of inproving yet to do. I'm also normally pretty cynical about all the high-tech junk that's marketed to golfers. At the end of the day the game is about hitting a ball over there with a club, so keep it simple.
Something that has made a big difference to my game recently though has been a focus on being more consistent in everything, including the kit I use. I used to use any old lake-balls and the cheapest multi-coloured tees I could get hold of. Whilst this probably didn't make much "real" difference to my shots it did mean that there was always an element of uncertainty about the ball height and how it might behave on impact. And for all golfers it's the time you spend over-thinking the shot that invariably sends the ball out of bounds.
So the simple marker on these tees, allowing you to easily tee-up the ball at exactly the same height every time, removes one of the many uncertainties involved in playing a shot. This is one less thing to think about or to doubt, so is worth bothering with.
A good buy and a good price.