yes, the draw back is if the aftermarket unit IE: in this case takes a dump, you either have to convert it back to points on the side of the road, or call a hook. They are typically very reliable, only seen 3 or 4 failures over 30 years.
The factory conversions on the other hand require a bit more work to install correctly but parts are available anywhere (usually). We are talking 30 old year technology, But they ( the MFR's) used the same stuff in millions ? of vehicles so the parts are typically available for the factory conversions.
if the after market stuff takes a dump You're DONE!!! hope this helps