Well I pulled the trigger on some DIY stuff, vg, pg, nic, various syringes, couple of flavors all just under 50 bucks. Normally I spend about 70 a month on joose.
I think you will enjoy DIY. MUCH cheaper and make what you want not what someone wants to sell ya. And yes some mixes will not turn out so good. Just keep good track of the ingredients so when one works well you can replicate it.
I started with those two myself. No RY4 for me. Don't like it.I'm keeping it simple for sure, just raspberry & blueberry at first then maybe some RY4 experiments down the road.
Once you get into more complex flavors, like Robert said, keep track. My latest effort is just a substitution of one flavor from my flamingo tutu tropical cherry. And it's just as good. I substituted the black cherry for the blueberry.