Case TV450. 11,000 lb machine. This one was dug around as I was moving dirt from this hillside over to the dam so it wasn't really dug in one pass. With the stump bucket I can make pretty quick work of most trees if they are standing and can use their leverage. Depends on soil but an 8" tree can be taken down in a matter of seconds. 14-16" tree in about 2-5 minutes. 24" tree in about 10 minutes of digging.

Here's a video of a 14" tree being taken down in soft soil.

[Linked Image from live.staticflickr.com]TV450 & Titan HD Stump Bucket - 14_ tree