I read German very well, but it has been too long since I wrote anything in German - sorry
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The MT harnesses to 18 kg forwardfacing. You must use it as a highback booster seat from 18 kg to 25 kg. I am not really sure why you can´t use it past 25 kg. A rough shot at it is the footprop in combination with the lack of the Isofix. The Evolva does not have this footprop. The footprop adds some weight to car seats. This counts for the MT as well. Most people don´t buckle up a booster seat which they should. The Evolva doesn´t have Isofix either.
The Graco Duologic is an Isofix RF seat. it cannot go forwardfacing. Furthermore, Isofix has an 18 kg weight limit which you must not surpass. This seat is outgrown once your children hit 18 kg regardless of how short they are. This seat has not been tested to carry children beyond 18 kg
the MT on the other hand - is a belt-installed seat - therfore the higher weight limit. Your twins have 7 kgs more in this seat.
SO, the DuoLogic will most likely take your children all the way to 18 kg but NOT to the top of the seat.
The MT WILL take your children all the way to the top of the seat onless you have two heavy weight children.
A good exsample olf this is my own daughter. She is 117 cm tall, nearly 5 years old and weighs 20 kg.
Cupholders are used hold cups of say- soda, limonade or water.
You feed the seatbelt through belt guides.
You CAN flip the MT to frontfacing at 18 kg if the child starts to become uncomfortable in RF position. But it is not something that you MUST do.
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