Tbh there's loads of stuff that's better than the Megs stuff you've bought, however it's all more expensive too. I started off with pretty much the exact same kit as you, and whilst I wouldn't buy that stuff again there's actually very little wrong with it if you use it properly. You'll find the paint cleaner and polish nigh-on useless by hand, but the wax smells lovely and the clay bar is still the stuff I'd buy if I couldn't find their pro kit. I quite like their GC shampoo, so it's very much an each to their own thing on that.
Either way, you'll have fun using it all and end up with a lovely shiny car at the end