I just use a regular iron but I sew in a small space and don't want any more clutter than I already have. I suppose if someone gave me a gift of one I might use it but I wouldn't go buy one.
Re - your wonky blocks...are you using steam or dry pressing it. do you press to set the seam first? Starch is my best friend but I have to be careful of moving the iron around....I try to just press.
Good luck sweetie!
Patti