I really want to test this beta. Is it really good compare to iOS 11.4 ?
As far as I'm concerned this is easily one of the most stable iOS betas - if not THE best - I've ever tried. Beta 1 was already great, but beta 2 seems even better! And yes, of course there are bugs. But honestly, it's definitely not as much as it was with iOS 11.4. The only 'real issue' I've been having is that my battery life sucked in beta 1. Have yet to find out with beta 2.
But apart from that... I'd say: try it! Just make sure you've got a back-up of your device in case it does come with too many bugs. You might want to carry at least a power bank to help making it through the day with certainty.
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Again, I'm really happy with iOS 12. It was already fast and everything, but beta 2 is definitely better. If Apple keeps up this good work, then the final version is probably gonna be the most stable iOS version since iOS 6.