I no longer have a dog in this fight having capitulated at 67.5c (d'oh!)
But my 2c is that you should base the decision on what you personally believe eRoad shares are really worth. Specifically, what they are worth under the current ownership (the calculus for Constellation will be different, because they can choose to change management/strategy etc).
The company reckons it can grow revenue by at least 6% in FY24 to NZ$175m, and transition to EBIT positive ($0-5m), plus an additional $10m due to cost reductions. *if* they do that, or even get close, and sustain reasonable top-line growth while improving margins, then shares are probably cheap at the current price. Likely very cheap where they were prior to the takeover offer.
On the other hand, they've tasked Goldman Sachs to do a strategic review (never a good sign), and the macro outlook is shakey (especially in the US). Transport fleets rely on volumes so they could be in for a difficult period.
It all got too hard for me, but I do believe there's a good business in there somewhere. I can see why constellation would be interested.