Pros
I was a field engineer and loved the work. The ticketing system interface was accessible via client computers, person computers and company provided laptop. My experiences predate my smart phone purchase, but I would expect that would have worked as well. The ability to update your paperwork, order parts online from so many options was great and you only miss it when you go to work for someone that does not have this. I enjoyed the management style as well. They are very focused (at least for my experiences) on empowering people to do their job. They don't micro manage and are scheduling meetings every day. They use the ticket system to generate reports and if there is a problem or concern they will contact you about it. However even that is normally avoided by the tech using good notes and updating the ticket every day.
Kontras
Due to a lose of contract the territory increased to be over 100 miles. This is really too much distance to be driving back and forth. It created a lot of conflicts with customers who you had to explain that sadly you could not service them the same day and sometimes not even the next day.