JMT is the best queuing solver out there. It is easy to use, has lots of features, well-documented and updated regularly. I used it during my Master thesis, PhD courses and also sometimes in my present PhD research. I learnt JMT directly from Prof. Serazzi (he was my Master and post-graduate research supervisor) and I am really grateful to him for building such a wonderful tool and giving it for free to the world.
Thank you for your work.
My company is small so I've been looking at low cost tools for modelling networks of queues. JMT has proven to be very comprehensive at the same time as being easy to learn to use. I am looking forward to the imminent release of 0.9.0 as it will hopefully address the assembly line reality where sub-assemblies are "consumed" into higher level assemblies. An excellent tool!
I'm using JMT in my PhD project and it is working very well. The discussion forums are very useful and I get lot's of help very quickly. My university team mentioned that they use JMT in their lab and they also recommend it. I recommend this tool.