Thats a gutter Matt, 4 days! Fingers crossed, but mines been running for 4 years and returning 41 mgp @ 75. Can't complain! Let's hope it goes for another 4!
At least you have the crusing cogs, I imagine having a 0.75 5th gear is almost like having a 6 speed box...!
What cog did you use in the other box? I can't remember.