I will say that Cantilena delivers a 5-star performance. They play this music with great passion and precision. The recording quality is outstanding. They nearly lift these primitive early symphonies to 5-star level. The length of this CD is 59:22 so each symphony averages out to a bit less than 10 minutes. These symphonies were recorded digitally in the Henry Wood Hall in Glasgow, Scotland in August 1987. Cantilena was a chamber orchestra using modern instruments
The informative liner notes mention that these very early symphonies are "important as a necessary background to the later symphonic developments of Haydn and Mozart." In fact, the sixth symphony here was for some time considered to be Mozart's 18th but further research demonstrated that Mozart copied it, when he was a boy visiting Abel's house, in order to study symphonic form.
At the same time, the liner notes comment that very few would claim these symphonies are masterpieces. That is really the bottom line. They are brief pieces which are pleasant to listen to, but are fairly easily forgotten due to their simple nature. To use an automotive metaphor, they are like Model-Ts compared to the classic Thunderbirds and Mustangs that Haydn and Mozart would later produce.