I personally stopped playing ladder in the moment I realized that the ladder rewards regarding idle are OVERWRITING the CW rewards, although they are both worse in quality (10% boost instead of 20% boost) AND quantity (lasts 1 week instead of 2 weeks).
For me it would be a minimum requirement to fix this huge bug before I will ever consider to join ladders again.
this still has been patched? been such a long while now ... and that's just flagrantly bad; has anyone let Fizzer know about this? mentioned it on an AMA? can't imagine that he's been aware of it and still not fixed it ... but then again, it is consistent with how everything else in Idle works so why not (like activating a CW reward overwrites a currently active one instead of extending it; how you can't even tell how much longer your current buffs will be active for, etc -- and let's not forget that you even need an Advancement just to even see what buffs are active at any given time)