Gardena programmers last up to two years, as others correctly mention. The first one I bought broke in the middle of the summer season, and I returned it to the retailer while it was still under warranty, and they managed to fix it somehow. The second one broke immediately after the warranty expired, and it seemed like it was showing off its precision in programming, not in watering but in malfunctioning. I handed it over to someone in their network in another city (they didn't have a representative in Thessaloniki at that time - and now that they do, their service is still terrible) and they never fixed it, they didn't even respond with the cost. Luckily, the third one broke within normal time frames, meaning it lasted for a whole season after the warranty expired and then gave up. Don't even think about getting it serviced, taking it for them to think about it, examine it, and discuss it just to tell you that it costs as much as a new one. There seems to be a major problem, neither the product is worth it nor the service in terms of network/service/representation.

A cheap one that I bought for 20€ as a backup lasts for many more years and continues to work. That's why now that the third one broke, I will stay away from Gardena, they can't even withstand a single summer use.

Stay away from Gardena.
Unreliable.
After two years, everything breaks.
Either the screens or the electric valves.
Unfortunately, here it's not what we call "you get what you pay for."

After 2 years, during which it only worked during the summer months and in a protected environment, while externally it is in excellent condition, the programmer had a problem and the valves do not open. The dealership told me that because the problem is on the electronic board, the cost of repair or replacement is almost the same as the total price, so it is not worth it. On the other hand, because 1 week has passed since the warranty expired, they told me that they cannot accept to take on the cost.