It doesn't seem that painful. It is a lot more user friendly than the other sites mentioned above and since they all seem to get their info from them you might as well go to the source to search and download the TSB PDFs.

https://www.nhtsa.gov/vehicle/2008/J...Communications




Select the area you are interested in, find the appropriate TSB, expand it then click on the download link:

 

Well you're right its easier than many others but if you want all XK 150's you have to do each year, a pain, but my comment was because I used to be "in the know" and could access the pdf repository and grab them all in one go even across different models. Now I'm retired and the site has updated I find it painful