I have been very pleased with Dungeon Crate, I've been subscribed for about 8 months now and really love the adventures in their crates they have been including.
There is usually a miniature from Reapers in the box that corresponds with the adventure, along with a few hand crafted items that can be used with the game or pins. some of the items aren't super useful but I've found use for a good portion of the items, such as the acrylic spell items like the webs and vines and the flight stands which my players love.
The Adventures in their crates can work as oneshots when you just want to get with a group of friends with minimal planning or you can plug them in as mini adventures in your on going campaign when you cant think of any encounters (like myself)
Their customer service is amazing, I've bugged them a few times on their Facebook account and every time they respond quickly and are always super helpful in assisting with what ever issue I'm having.
Shipping is usually fairly quick with about a week turn around from when you receive the notification.
Overall a really good service that i recommend for any DM's or players looking to DM in the future.