Did you find that studying using a pencil and scratch paper hindered your quant performance? Would you recommend using a dry erase board and marker to prepare?
It not a matter of whether using a pencil and paper would hinder your performance in the GMAT, it actually a way of toning your mind of what you would expect at the real test. I bought the Maker-Noteboard for my practice as i wanted to get familiar with everything that gets my mind in sync with the G-day experience. Actually, this may sound ridiculous but 3 days before the test, i woke up, took a shower and dressed up in the same clothes that i would wear to my test and took a practice test.
Coming to the marker and note board concept, i think its a good investment for your prep. A marker makes a thick impression than a pencil so practicing with it would get you familiar with the space allocation on the test day. Also if you practice with a pencil, you would just let it lay around during your breaks (while taking a practice test) but if you do so with a marker on the test day, chances are that the ink is going to clot and you may have difficulty in writing when the next session starts. This is expecially bad at centers where the administrators give you only one marked and board. Luckily the center where i took the test gave me 2 boards and 2 makers!!!
I would definitely recommend it but its just a matter of choice!!!
