I agree the autosave feature is ridiculous. I can't understand how developers justify using it. Could they at least offer the option of a manual save? Is it a software issue? I will admit complete ignorance in this area.
Having said that, and also admitting I haven't finished the game, I'd say it's well worth the 1200 points. More than worth them imo. I haven't experienced the glitch MM209 mentioned, and it would surely piss me off if I did. As it appears to be a rarity - and as the game is greatness stacked on awesome surrounded by fantastic - I'd say it's one of the few games which lives up in value to the points it costs.