As a former Sidekick owner, I can say that the 7135 is much more reliable. I've listed some of the issues/complaints with the Sidekick below:

- GPRS signal was down more than it was up making it impossible to access the web when you need to. When it was working, many sites were returned as unreachable. No java.
- B&W screen
- Constant dropped calls - known issues with the unit's antenna
- No speakerphone
- Calls would come in but Sidekick would not ring - a known software problem
- Very awkward to use as a phone
- Terrible signal strength. The worst of any phone I ever owned
- Hardware integrity - many problems with broken keys, screens, etc

I was told by T-Mobile that this device has caused them a lot of problems and the stores have stopped selling them. There is a new color screen version coming out that may have more reliable software but that's a gamble with T-Mobile's network. The one thing I do miss is having a keyboard. That made a huge difference when entering data and was a big plus for the SK.

Verizon's network is unbeatable at this time and I've experience none of the problems listed above. The 7135 does do a better job of web browsing. However, I am still looking for that perfect Palm OS browser. They all have their limitations and I've tried them all.