Oh man, is it ever. Drink it all the time.I can vouch for the chocolate chili chai. My girlfriend picked some of that up last year and it's delicious.
One word of caution with the Perfect Mugs (in my experience) is to get one with a ceramic or glass lid. I got the one with the bamboo lid and it's starting to warp/crack a bit after 1+ year of use. The infuser sits on the lid when you're drinking the tea and the excess liquid from the loose tea probably causes the issue I've been seeing on my bamboo lid.
Otherwise, I'd really recommend the mugs. Great design and it's a cheap way to get into drinking good tea!