Last weekend I was able to contact an Special Event station, on 80m, using just the 5W my Flex-1500 provides. I had already logged the contact an hour earlier using a 200W rig (my Yaesu FTdx-5000MP) but I was curious about using QRP to do it, so I tried. And it worked :-)
So, yes, with patience, this small QRP rig works wonders.
73 JOSE EB5AGV