Adding a thermocouple to it has made my experience infinitely better.
The temp strips are decent but if you switch coffees often they are just OK.
Recently I bought the TL0225 thermocouple along with the TC0520 Thermometer and it has made it so easy to find a repeatable temp. It has made my espresso so much more consistent I felt I had to share.
Here is what I bought:
https://perfectprime.com/products/tl0225
https://perfectprime.com/products/tc0520
Having this set up has really made my life easier and I have been able to become a lot more consistent with my daily espresso.
There are many threads on placement of the probe so I won't get into that here but I did want to share my extremely positive experience.