My $0.02
I'm a well seasoned weed smoker, but I actually do prefer to some extent the highs from kronic. The pineapple express one did give me a pretty bad panic attack in a large dose (about ~7-8 cones, I like seeing how high I can get off of every weed I get, but the aminoalkylindole cannabinoids (which the cannabinoids in kronic most likely are) are for the most part full CB1 agonists, whereas THC is only a partial agonist, so they do need a little more respect than green), but the other ones are very pleasant, and have some distinct effects different from THC. The kronic blends also seem to be a good consistency, I've seen others that were full of twigs and shit.
It's so nice being able to choose what type of high you want, you just don't get the vastly interesting range of effects with different strains of weed as you do between these different blends. And they don't really make me tired like weed does, so I can be a lot more active and sociable while still being reeeeaaaally high.
Don't get me wrong, I love weed, but these synthetic blends are good in their own right. Just don't expect the munchies from any of them - that seems to be a property unique to THC and its relatives.
Edit: It's a lot cheaper buying it online, but it is awesome when you are out of green and you can just walk into a store and buy it hassle free, although the price hike in the store compared to online is a tad ridiculous.