How Reliable Is Temperature-Controlled Freight for Sensitive Products?

I’ve been helping a small food supplier expand deliveries to new regions, and we recently had a shipment arrive outside the recommended temperature range, which raised a lot of concerns. Since then, we’ve been researching temperature controlled freight, but it’s difficult to know which providers consistently maintain proper conditions throughout transit. Some companies advertise advanced monitoring and tracking systems, while customer experiences seem to vary quite a bit. For those who regularly ship food, pharmaceuticals, or other temperature-sensitive products, how reliable has temperature-controlled freight been in your experience? I’d really appreciate hearing what worked well and any challenges you faced along the way.