"This is a wow, for sure. I have a Surface Pro 4, and it works quite well with Adobe Illustrator and Photoshop. The N-Trig pen works well and has a nice friction with the screen. Overall, the wobbly line issue is a minor problem with the SP4, and is a non-issue in Adobe Illustrator, where you are working with vector graphics. About expandability - Contacted Microsoft and found that you cannot add RAM yourself - it has to be brought to a store and will cost about $500 to go from 8GB to 16GB. "