I have a Bosch GAS 35 and it works very well with a cyclone attached to it.
No more clogged filter or bags. Suction is good even when the cyclone bin is nearly full.
Interesting thread, especially reducing oven usage. We have for many years used a Grand Remoska instead of the oven.
Its capacity is 4lt and rated at about 550watt. They have made in the Czech Republic for 60 odd years. Lakeland stock them.
We cook everything from whole chicken to leg of lamb...