I have the MP-1 and it works fine, but I really need to lay down good radials for it to perform.
On the other hand, my go-to QRP antenna is the Par EF-10/20/40. Once I got it trimmed (easily done with the good instructions) I just through it up in a tree and it works every time. I have talked all over the world on CW, PSK31 and JT65.
Kansas City, MO