Buggy, unresponsive, and finicky about your browser are what I think of when I see Flash.
There's really no download required to get the full playing experience. Chrome, Safari, Edge, and even (gasp in horror) IE. It all transferred and loaded each lobby and real money table within 3-5 seconds. I've tested the 888 Poker no download client from a Windows 10 PC, a Mac, an iPhone 6 Plus, a 3rd Generation iPad, an Android phone, and a cheap Android tablet. It just works from every device and every browser.
Why it's probably the best no download poker site:
