Glad I did it too, was afraid I wouldn't be able to watch the first series, since it's OOP and hard to come by for a reasonable price (I dislike LEs/CEs with big cardboard boxes, that's why I didn't get the UK ones). I held off a little on whether or not I should start Brotherhood, before I got the first series, but a couple of days after, I purchased it from a user here
I really liked the show up until the turn with the gate, and with that being said, I don't think I'll like Shamballa all that much (still gonna enjoy it, I hope) but am interested to see what happens.