I have taken my BA in History and am now studying for an MA in History online.
My BA was taken via the online department of a Brick and Mortar College.
My MA is being taken with another institution. Both experiences have been very different.
My BA classes were taken in 8 week sessions. Lots of interaction with instructors and I enjoyed the experience a great deal.
My MA classes are four week sessions and I am a little disappointed in the experince. The time period is too short to learn very much. One must begin writing ones end of class paper on almost the first day.
Online classes are not easier than in seat classes, you can log on at anytime which is good but you must have the motivation to do all the work, there is also a lot more reading than in in seat classrooms, as you must read all your fellow students comments in order to gain the full benefit.
Teachers also make or break a class, like in a normal college or university there are good and bad teachers, some can and do use all the tools available to create good classes, video conferencing and internet whiteboards allow some live interaction between teachers and students. Others merely say read the book and post an answer to this question.
If you can put in all the work and deal with the distractions of studying at home, online can be a good experience.