For their size both the 2.2 and the 2.4 roll remarkably fast. The 2.4 though is much slower than the 2.2, not to mention much heavier.
They both roll well over rough terrain and grip particularly well on wet roots. Running these tyres effectively gives you 650b wheels due to their massive volume.
When it comes to grip the 2.4 isnt in maxxis minion territory but the trade off is much less rolling resistance. Neither of the sizes have what could be described as a good shoulder tread, which means they dont corner as well as a highroller, minion or nobby nic but again they are faster rolling.
One of the biggest negatives are that they are not good in the mud but then they are not designed for that. Also due to their lack of a good shoulder they tend to struggle slightly when it comes to a wet surface over hard pack, in other words just after its rained on dry dirt before it gets chance to soak into the ground. In this instance they tend to let go quickly and early. These are very specific conditions though.
Ive used 2.4’s on my downhill bike for flatter more jumpy tracks (PORC for example) and they are just effortless to keep moving compared to my usual DH setup of a minion/highroller. However on steep tracks where you want all out grip and cornering ability I would use something else.
As a general all mountain type of tyre they are hard to beat, and in general the trade offs are less in all areas compared to other tyres. For this type of riding I use the 2.2’s, fitting a 2.4 up front simply adds unnecessary weight and rolling resistance for little extra grip.
Finally if you dont want to pay the extra for ‘black chilli’ then dont bother buying them at all.