CalMag is something to use as needed ( a lot around here will say is not needed) not as a general solution. Cal deficiencies are easy to diagnose (I’ve never had a mag issue).
I wouldn’t recommend my nutrient to anyone not experienced (even I question my sanity in using it but it works and has for years)
I’ve been debating changing, browse around here see what folks are using. I’ve Talked to quite a few growers recently who are happy using Jack’s (non organic) and it does seem likea no brainer for new growers. I would say follow the KISS philosophy, you can find good ferts that are simple 1-2 solutions for veg and flower.