The A-190 MIDI-CV/SYNC Interface was the only one available and there were not many other options. (the A-191 MIDI-to-CV Interface / Shepard Generator was way more complex, i will discuss it in a future blogpost).
The A-190 is a powerful module that not only provides a few CV and Gate outputs, but also Portamento, Scale-settings, Pitch-bend, Glide, Clock and Reset signals, has a built-in (software) LFO and very flexible programmability.
Without a proper display it is quite awkward to program, but you'll quickly learn how to read the combinations of burning and flashing LEDs.
I do miss some further (software) development for this module. The arpeggio function, mentioned on the front-plate isn't even implemented (!)
A cheaper option that you can buy nowadays is the A-190-2 Midi CV/Gate interface, which is based on the Doepfer MCV4.
A-190-3 USB/MIDI-to-CV/Gate InterfaceDark Link
A-190-5, but it will be completely redesigned this year. A final version will probably contain an LC display (similar to the A-187-1), some control buttons, a USB interface and higher resolution DACs with higher voltage range (probably 12 bit and 0...+10V). It will be a four voice polyphonic Midi to CV/Gate interface with 12 CV and 4 Gate outputs and different modes (e.g. unisono, four-fold monophonic, different four voice polyphonic modes.)
Tip: The monophonic MIDI-CV converters can write and read to the A-100 Busboard, more info on this HERE