Get it if you like. I can't recommend it.
Galactica devolved over the course of four seasons from tightly wound, conceptually freighted, socially-minded military SF to half-baked religious fantasy; as the writers' conceptions of the characters grew more involuted and eventually self-devouring, the actors were given 'more to do' but found less and less humanity in the process. Moreover, the writers' ability to make the show up as they went along wasn't consistently maintained for the full series run; showrunner Ron Moore's episode commentaries can't quite cover up the desperation of the show's later plot gestures. The early part of Season Three, a feverish Iraq-plus-some-other-stuff allegory, was Galactica's peak; after that the descent into half-baked pseudotheology was too rapid even for me.
The best of Galactica was good indeed, and as 'pure TV' - audiovisual spectacle and melodrama - it's some of the best in the medium's recent history. Certainly it set a highwater mark for the production of spacegoing SF on TV. But the show's imaginative poverty is maddening in retrospect; it's no longer easy to overlook the self-referentiality that so often substitutes for TV psychology, the lurid pseudocharacterization, the plot 'twists' plucked out of absolutely nowhere.
Galactica's main problem is the incoherent 'mytharc' and Cylon religion, which Ron Moore chose to make the sole focus of the series in its late run; its strength as a combat-heavy tale of fleeing an implacable robot enemy was entirely dissipated by the domestication (and schizophrenic treatment) of the Cylons. As on Carnivale and like Lindelof/Cuse on Lost, Moore evidently became convinced that enigma was a dramatic end unto itself, which would be forgivable if he hadn't doggedly insisted from the show's first moments that 'the Cylons...have a plan.'
They didn't have a plan - they had an attitude. Unfortunately the same is true of the writers.
The final episode of Galactica is one of the most contemptuous and solipsistic pieces of 'science fiction' I've ever seen or read. After the operatic ridiculousness of the Season Three finale I had high hopes for Season Four, but after just a handful of episodes it seemed that the inertial illogic of moneymaking serial TV had overpowered critical thought or insight; the last episode makes it clear that the buffoonish religious/historical allegory couldn't be blamed on anyone but Moore himself. The series began near-perfectly in one of TV's first believable spacegoing worlds; it ends somewhere up Ron Moore's ass. What a disappointment.
Actually it has a lot in common with the finale of Lost. (That's a bidirectional insult, in case you're wondering.)
Well, it's there if you want it. I could almost be convinced to watch the show again, even knowing what a pathetic (handsomely-produced, intensely-acted) shambles it eventually became; that's how much fun the good parts were. But there's too much good stuff out there. To hell with it. Buy The Wire instead.