I found something those who still have to decide which lightpad to buy might find very interesting:
The full information sheet can be found here:
The only downside I see -without having it- is the 1 year warranty. In my eyes a bit weak to give only 1 year. It feels a bit like "don't expect it to last longer" which is -given at the high price for the big version- a downer. Nevertheless it's neat!
I still use my Dörr lightpad (more of a lighthulk since it weighs... a lot) and am happy I purchased that monster.
Before you buy a pad make sure it 100%ly fits your needs and is really big enough for all sizes you might work with. No use in buying a small compromise you end up using only randomly and with the gnawing knowledge that a bit more saving up might have made your life a lot easier.
I think everything under A3 is ergonomically-wise a catastrophy. If you only work on ACEO size.... A4 might be good after all but for A4 illustrations A3 is the most compfy solution.
Keep in mind that you have to rest your lower arm on the surface to relax your shoulders (and avoid possible tendo...). If you can't rest your arm properly and relax your shoulders while working with a pad it's simply put crap.