I've had my eyes tested on electronic charts before and found that I could remember the letters. With the Acuscreen chart constantly changing the letters I really felt like I was getting a thorough and accurate eye test, giving me the confidence to buy glasses and contact lenses that would give me the best possible vision.
Acuscreen has many clear advantages over the traditional snellen chart. Particularly useful is the ability to cycle the lettersets to stop patients memorising reading from memory and the feature to isolate lines and letters.
I'd happily recommend the Acuscreen product as a cost effective tool for any optician.