Hi Andy we have W168 ACS 170 Avantgarde, Great little car, extremely practical, massive load carrying capacity(all the seats out) and economical. Only issue is they ride very firm but that’s the price of MBs safety tweaks. If you are maintaining it yourself it’s not expensive.
Lots of miss-information around concerning the gearboxes so heres the facts
The w168 A class only ever came with Two Gearboxes Manual or Automatic - Nothing else! There is No Semi Automatic Gearbox W168.
Everyone knows the issues with the Automatic boxes but the Semi Automatic or (ACS/AKS) is not what is seems;
The ACS (AKS) - Automatic Clutch System commonly and mistakenly referred to as “Semi Automatic or Clutch Less” is neither.
It is 99.9% identical to the Manual W168. It has the same Manual gearbox, same Clutch Pressure Plate & the same Clutch Hydraulics. What it does NOT have is a Clutch Pedal in the interior.
Instead it has an extra box in the NS wing called an ACS module which is just an electric motor that operates a push rod connected to the clutch hydraulics – Disengaging & Engaging the clutch, when you move the manual gear stick.
It also has some electronic programming in the instrument panel telling you which manual gear has been selected N,1,2,3,4,5,R & (F for Failure)
You drive it just like a manual but you don't use your left foot.
ACS cars got a bad rap when the ACS module failed and the car wouldn’t go into gear. At the time MB quoted a £1000+ to replace the whole module. However you can replace the electric bushes yourself for less than the price of changing the bushes in your Bosch washing machine i.e. £35.00.
Apart from the above all other ACS related failures are identical to the Manual car. If the gear box won’t change form 4th to 5th chances are its the 20p MB plastic gearbox linkage that’s popped off.
In addition ACS cars can and have been converted to full manual.
Can't comment on the autos as never had one but would I buy another ACS car - absolutely!
Lots of Manuals & ACS cars around so take your time and choose the best
Hope this helps.