IMO the Samsung is the least attractive offering of the Chromebooks. I ended up with the HP11 (but for a very specific reason), but the two that screamed best value to me were the 4GB RAM 720 (which I can't find actually for sale for $250ish) and the 720P. I played with the 720 quite a few times before buying my Chromebook and it's a snappy device with plenty of power to run many tabs, keep docs flowing and for YouTube, etc. My HP basically is the Samsung one from a processor standpoint, but it has a few much better features, but I will admit that it's noticeably less capable than the Haswell devices, even though it's more than suitable for me to use in class and for forum cruising and social stuff.
If I was going to try to quantify it, I'd say the 720P is worth about 4 times the value per dollar of the Samsung and is WELL WORTH the $50 difference.