sorry, wrong.
both the squat and the bench press is not an angled movement, but rather an S shape.
no matter what angle you put on there, or even if you build an "S" on a machine, itll fit only 1% of all lifters- if that.
the variation and differences between humans means that unless its mapped via a computer, for each individual, then made- itll fit a tiny portion of trainers.
the rest it wont fit at all and encourage movement through incorrect planes..making it almost as inaccurate as the straight smith machine.
its useful for safety only...period. if you are happy to work through less than optimal range, and put some muscle complexes at risk by doing so, then go for it. you will never lift as heavy as free weights for that reason, so what benefit is it giving?..
its purely safety and the ability to go the extra rep without concern...but you'd probably get more benefit from more weight using free weights or doing an exercise like leg press for instance.
maybe the only exercise that its almost ok for is military presses.