My LV saddle square is one of three tools that I wish I had bought 10 years earlier than I did.
The other 2 - Starrett fractional dial caliper + Starrett 4" double square.
Those 3 - plus the Starrett 12" combo - get used - constantly - every day.
Well - plus tape measures - I buy Stanley 12' x 1/2" tape measures 6 at a time for about $4, scatter them around the shop, check the calibration often, toss + replace as needed.
When I started woodworking, I didn't know squat. I have progressed in 30 years - now I do know squat.