I assume that the Omega is a D5XL enlarger.
Depending on your local market, this deal might be favourable to the other person, just because in some areas darkroom equipment like this is almost being given away.
If the darkroom equipment and camera is in good shape, IMHO the real question is whether it has value to you! If it is what you are looking for, by definition it does.
And you can be confident within a short while you will be easily able to replace the Pentax digital equipment with either something "NEW and IMPROVED!" or with a used version of the same thing at a reduced price.