I tested the esim travel simcard in my home country Germany. at the time of testing it offered the best no frills esim deal if you need a moderate amount of data. I got 3gb for 8 Euros for 30 days. I was booked into the vodafone network most of the time, but speeds were rather slow. I am not referring to download speeds, but instead reaction time speeds, despite full signal strength. oh well. What bothered me was that there is seemingly a DNS filtering active that I was not able to influence. For example, I was not able to use the Edeka app which I use for payment in Edeka supermarkets in Germany. if I switched to wifi or my primary sim card (local Telekom), there was no problem using the app at the same time and location. All in all okay, for email, surfing, whatsapp etc. but other travel esim providers don't have the mentioned limitations, albeit for a higher price. So it ultimately depends on your priorities.