I also use Embird and I'm very happy with it. I had Customizer 4D from HV first, then PE Design but really just wanted to be able t edit my designs and add lettering. I really wasn't into Digitizing my own. The upgrades for both those other software packages were about $500.00 and there was a new one every other year or so. I really couldn't keep up and wasn't using the programs fully. I went with Embird back in 2004 and have been very happy with it. Upgrades are every couple of years, but only $20.00. I do have the digitizing part, but still don't use it. There are a couple of Yahoo groups for it that are very helpful.
I got my 15000 a couple of months ago an I just recently converted all my files to .jef. I did whole folders at a time so it was pretty quick and easy.