Wow, that reviewer doesn't know a thing about the tablet. All of that is completely false. Pretty much everyone around here doesn't use the device on Sprint.
1. The firmware updates come from HTC via the internet. While Sprint has a hand in approving them, they don't actually send them out. I had no problems downloading, installing, and using the OTA Honeycomb update without any Sprint service. You don't need any PRL updates if you're not using it on Sprint.
2. You can easily turn the cellular radios off - it's called airplane mode. You can still use WiFi/Bluetooth/GPS in airplane mode. There are also other simple ways to deactivate them discussed in this thread
3. When you boot up the tablet from being turned completely off, you get a prompt to activate it, which you can quickly dismiss. There are no other Sprint prompts at any time. There's no "nagging" whatsoever. And you can even get rid of that activation prompt with root or without root.
4. There are never any interruptions to activate the tablet after the first one when booting it up.
5. The screen is exactly the same as the screen on the Flyer.
Now, as far as being able to use it on an Indonesian CDMA provider, that's something I can't authoritatively give an answer on. In the U.S., it can be successfully flashed to be used on only one other CDMA carrier - Boost - and that's because Boost uses Sprint's network. I'd say there's a good chance you may not be able to use it with any Indonesian CDMA carrier, but I can't say for sure.