Even if you're cautious about downloading the beta, just seeing what other people think and experience should be as fun as any Reddit thread.
A quick read of the threads so far:
"Unexpected shutdown of Technology Preview"
"The UI is so UGLY an there are no options to change this."
"Hey Cortana Play Music"
"OUCH! NOT GOOD! Things Freezing All Over"
But that's okay. This is a beta. Microsoft wants you to tell them what's good and bad, perfect or broken.
"We're well way on our way to making Windows 10 the largest-ever open collaborative development effort Microsoft has ever shipped," said Windows honcho Terry Myerson in his Windows 10 blog post on Wednesday. "Since we launched the Windows Insider Program in September, we've been joined by 1.7 million Windows Insiders, who have delivered over 800,000 pieces of feedback. We are truly co-creating the future of Windows with you and we're humbled by your valuable role in this new open development process."
So go ahead. Tell Microsoft what you think.