They will have trials... but to your question on cost benefit.. Drivehud 2 is one of the best priced trackers on the market. So what you get for the money is really good. It has a 30 day fully functional trial.
why do you need to use a tracker because you can show excellent results without trackers with your game and training, I think you shouldn't have a friend better to achieve a little more time on your own, but you will achieve it yourself