Box clamps - useful?

[fifo28]

Are box clamps use full and do you use them.  I have tried the preformed 90 degree angles clamped to the cabinet sides and found them difficult.  I am messing with the Woodpecker box clamps and again difficult to get aligned and properly set.  Has anyone used a clamp they are happy with to assemble larger boxes?

Thanks

 

[Billedis]

I have the Woodpecker aluminum box clamps and use them all the time when making dovetailed drawers.  They are a snap to use with the knobs.  Best investment on clamps Ive made.  Bill