Vapor X5 has a good dose of caffeine and great flavors. Always competitively priced. One of the ingredients I always look for in a preworkout is betaine, because studies have shown 2-2.5g taken consistently over four weeks helps increase power (not strength)! If you’re bored of your pre-workout, Vapor X5 should be up next. They also have a Vapor X5 Neuro, but I cannot speak to that version.