I have quite a few of the Esci kits, the Mercedes 190E, 190E 2.3-16 aswell as the crystal version (in my eyes that is just stupid as the rest of the parts are not clear) and a dutch police version of the 190E (only differnce to the ordinary 190E is decals and a blue light for the roof). The 190E was also re-released in the same period by Revell Germany as a Kamei X1 kit, with extra bodystyling bits.
I also have the Mercedes 450 SLC (W107), Mercedes G-wagen (also re-released by Italeri and Revell later), 1984 Ford Transit (have gotten rare and expensive to find), Land Rover series III 109" (also rereleased by Italeri a few years ago) early two door Range Rover (rereleased by Italeri a few years ago in a Paris Dakar version), Toyota Land cruiser (was very expensive a few years ago, saw one on Ebay go for 236$, but has been rereleased by Italeri and can be foudn quite cheap I think), Renault 5 Alpine (planning on using bits from the new Renault 4 two make a standard looking R5) and a 1:32 Volvo F12 truck that is a snap kit but still quite well detailed.
Common to all these kits are that they are quite well detailed but not up to modern kit standards. The Meredes 190E, SLC and Renault 5 has engines and I think you can get fairly nice detail out of them with research and work. The SUVs (G-wagen, Ranger Rover, Land Rover, Land Cruiser) and the Transit have no engines but are still very nice kits. Well detailed chassis and and suspensions. I built the G-wagen and the Land Rover and as I remember they went togheter without much problems. A mate of mine built the CJ7 and he claims it to maybe be the best CJ7 kit out there even if it has no engine.
Here is a couple of pics of the 1:32 Volvo F12. Not painted and without headlightlences, only put togheter.
And here is a few of the Land Rover, never got pictures of it finished as it was going in to a diorama that I never really got around to.
And here is the 230G
I also saw pictures of the BMW M1 some time ago and it looked nice. I think that one can possibly compare the Esci kits to the MPC kits of the late 80s. Not quite Tamiya in quality but still not bad. They also had some interesting subjects in their lineup.