The LT has performed very well for me RF-wise. It is a little too chunky for my taste in form factor which is my only really gripe about it. I did have one fall off of an actor (probably my fault) without my knowledge. When we ran the subsequent take, I had no signal from him. I went over and he had set the pack back on his belt, but the battery door I guess had come slightly open when it fell so while the batteries were still in there (loosely), they weren't powering the Tx. Everything ended up being OK but I don't believe that could have happened with the SMQv.
I think when the LT first came out, there was some speculative talk about a 100mW wideband SMQv. I don't know if something like that is in development but if it was, I'd probably buy 4-6 of them. I rarely use the 250mW setting and I think Lectro said 250 mW wouldn't be possible with the widebands which is fine with me. I just desperately don't want to buy the SSM's because I don't want to invest in new lavs with different connectors (though the new threaded B6s look interesting) and of course, they run on those cell phone batteries. If this hypothetical wideband SMQv isn't announced in the next 12 months or so, I guess I'll bite the bullet and get maybe 2 SSMs just to have more wideband transmitters that aren't LT's. Of course it's nice to be able to hide them too.