I had some involvement with several of them in the mid 1990's. We prepared one for ice racing. I can't say that I have any "excitement" about working on or owning one today. They are heavy and underpowered with the added disability of a clutch disc that is too small given the weight of the car. The result of that being a car that will use up the clutch very rapidly if you like to do performance driving or track events.
The independent rear suspension is also massively heavy. My friend and I decided to sell off all but the ice racing Merkur, which we only ran in a rubber to ice class. Running the studded class would have smoked the clutch just like road course use did.
So, don't lose any sleep about not having a Merkur!
In day to day use, the wait for the turbo to spool up was about as exciting as a long, wet, fart.