I’ve hired one a couple of times and will do so again in the future. They are great, particularly if you are not right in front of a big screen and cannot decipher the tannoyed commentary….it helps to keep track of everything that’s going on everywhere on the track and in the pits, the minute it happens.
On-line price last year worked out at about £43. You can either pick up and drop off at the circuit or have it posted to your home address and post it back. You can also just turn up on the day at their trade stand and hire one directly, depending on availability.
They are very easy to use, come with a spare battery, mains cable for charging, and a set of adaptors for foreign electricity supplies.
All in all a great device, in my humble opinion :-)