Worth the grind, definitely not bearable for most players. Just play as a TD but not too far from front lines.
If memories serves me right, it has DPM of tier 5s. 9s. Thanks Rexxie <3 U
IMO, the Churchill III is well worth the 750 gold. It's a solid tier 5 premium tank (with limited MM so it only sees tier 5 - 6 battles). The others pretty much said what I would have said.