I've only crimped and have had no issues so far. For most electrical connections, I've found crimping to actually be more reliable than soldering in long-term use, but I've heard weak rumors of crimping issues and flexwatt (but never actually even heard as much as second-hand accounts of "my friend had blah blah blah happen").
As for proportional t-stats.. good question! I'm going to assume AC, but you could easily find out by writing the manufacturer. Now that I think about it, I'm pretty sure that, as electrical devices, aren't they required to have all the input/output information written on the main unit (such as with power supplies)?
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