Typing Just Got Easier

When the tablets came out, one of the first things that was noticed to be a disadvantage from laptops was the lack of a key board and how hard it is to type. Even though the tablets can do everything that a computer can, it is still hard to type on them. If you are a business professional, it is probably better to use the tablet for some tasks and other tasks such as reading and writing emails or internet fax, it becomes tedious and inefficient. The solution to that are Snapkeys. Snapkeys uses a few invisible keys on the screen to enable faster typing while leaving the entire screen visible. It's done by dividing the alphabet into four categories based on what the capital letter looks like. Letters that have one point at the bottom — for example, T, I or Y — are grouped into one button. The other three stand for letters that have complete circles (P, B, O), letters that have two points at the bottom (W, H, K) and letters that have a line or curve on the bottom (E, L, C). The interface also allows for numbers, symbols and punctuation marks.
Snapkeys uses a type of predictive text (similar to how T9 texting works on feature phones) to derive words from the order those four buttons are pressed. Finally, two buttons on the left and right edges of the screen stand for the backspace and space keys, respectively. Do you think this would be an efficient way to type internet fax, for example?