How much would one miss vs a Maths when combining a mini slew and for example a Triatt?
Obviously you’re missing 1 of the 2 shapeable outputs of the maths (channel 4 basically) and the sum/or outputs, but are you missing anything else?
The mini slew looks pretty nice, also has end-of-rise and end-of-cycle outputs like the maths but on a single EG instead of on two separate ones.
Main detractor for me are the imho quiet annoying blue LEDs 
[edit] The last sentence was merely about the blue color of the LEDs not about having the LEDs in general 
I find the blue too bright and it makes it hard to read the panel labels.