Our Blood Bank uses Hemotemp II's but they are only good applied to the bag for about 2 days. They also have to be activated with a 40C incubator. We use those for units in OR coolers and trauma.
If you want tracking for the life of the unit, Safe-T-Vue's are pretty much the only option.
I second everyone's frustration with the Timestrip BT10's. We tried them for our trauma bay and they fell off all the time despite prepping with alcohol and wiping condensation off the bag. They'd also activate if you looked at it wrong. Our rep said the lots we got might be bad because they were in her hot car.
@RRay I think the decline might be due to hospital networks going single source and racing to the bottom to get the cheapest things. There's no incentive to make a higher quality instrument/reagent/etc. if the hospital networks are only going to look at upfront costs and ignore the issues caused by low quality/bad service/insufficient supply.