Depends on your pocketbook !
I did several BOM before, 2 were worth it and are beautiful quilts (but pricey even 8-9 yrs ago at $20-25 mo). The 3rd & LAST one I did from a different LQS, was a BIG disappointment ... directions & measurements were wrong, fabrics were very skimpy. The shop gave us more fabric, but I got tired of trying to "fix it" and gave it to a friend. It's still on her UFO shelf today Lol
IMHO the $5-10/free BOM are great, but the designer BOMs are MUCH more expensive than making your own quilts !