Depends on how you are growing but like most nute plans it wants you to dump out good nutes every week so you use lots of nutes and have to run out and buy more. I rarely change nutes in DWC so things like that I guesstimate how much they need because if I tossed in a full dose of say, Big Bud, every week I'm sure I'd overdose the hell out of my plants.
What is that stuff by the way?
I am of two minds on this, and I suppose it matters how big the rez v how many plants and how big the root systems.
In smaller rezes like I use <3g) IMO, whatever individual nutes the plant/s is/are using up COULD/MIGHT upset the balance, possibly causing lockout, and/or deficiencies. In my case it doesn't cost that much to change out regularly. I don't in veg as this is the earliest stage of root development, but once buds begin developing, I top off with more nutes once or twice, then change
OP, I used V + B for a few years with excellent results, but was less enthused to simply add +Life as the N in V+B is very high. If your concern is simplicity, once you flip, I suggest NPK RAW Bloom nutes (one part dry formula) I am on my 2nd grow using both their Veg and Bloom nutes
hth
