Digital BW, The Print

I'm wondering if any of you are using Genuine Fractals.  On the face of it, the 
program sounds good.  Lizard asserts that one can take a small file and 
enlarge it withous loss of any kind.  For example, one can take a file that prints 
at 8x10 satisfactorily but at 16x20 is unacceptable and using Genuine 
Fractals can enlarge to 16x20 "lossless" or even larger and have the same 
sharpness one had at 8x10.  I'm thinking that if the deal sounds to be too good 
to be true it probably isn't true.  I downloaded a trial version and frankly it 
looks good to me.  But, before springing for $300.00, I'd appreciate imput from 
those who may be experienced using the program.  Any thoughts on this 
issue?  Thanks in advance.
Joe D.