What can I say? This is a pack of hits and probably the only pack I recommend at full price.
The only disadvantage of the Comet Ambienta is that it makes the very similar Stern-Berger Majora pointless.
The Evo Urban can be used alternatively with the Nova SA from the Player's Choice pack for a one-two knockout on urban bus lines.
The Bergstrom Light's okay I guess. Statistically, it's a posher and more espensive version of the base game's Scanditram Master, but it it's the only choice for high rider comfort in the 18-passenger gap between the two Prospecta Royals.
The TTS Tramcar is like a little metro train and is a great vehicle to use on Dedicated Right-Of-Way tramlines. However, most trams are half its length making it very unmaneuverable in comparison. Frequent intersections and stops are its demise. I usually run this tram on metro lines instead of the Capitol XT30 or Arnauld Metropolis.
The Stingray Cityjet is the single most versatile Waterbus in both CiM and CiM2 and is hands-down the best water vehicle in both games. If it can't make a line turn a profit, no Waterbus can.
The Ness Light Trolley covers the weaknesses of the Stern-Berger Guide very well. It shares all of the advantages and disadvantages of the TTS Tramcar and like the TTS, most trolleybusses are half the Ness Light's length.