I use the 650 for smaller systems when the budget is low or there's no good reason to go with a higher model- it usually just works, as you posted. WRT errors in commands, you can go to the setup for the activity and click on Troubleshoot. Inside that section, you can change the number of repeats for the codes (most remote brands repeat the code three times, but sometimes 3, 4 or 5 works better). There are many reasons the activity might not work perfectly, including too many codes reaching a device and it goes on vacation, a device that requires a longer delay between power on and the input command, codes for more than one device that may be similar to another, but confuses one of the devices.
I have a Panasonic plasma that doesn't use discrete codes and most remotes just have problems with that so I just put an Input button someplace that's convenient an it works well enough. The Elite nails it.
BTW- if you go to the setup for Activity, look for a button called 'Sequences'- you can add delays to allow some devices to catch their breath and IIRC, you might be able to re-order the devices in the activity.
For any system with devices that all use discrete commands, pressing the activity button again will cure any problems as long as everything has good line of sight to the remote but the Help button is not only a way to get things working, the remote actually learns what it needs to do and this makes these unique.
BTW- I don't know if you used the old software to program yours, but you probably saw that it would allow 5 devices- download the new software and use the existing sign-in to make changes- it now allows 8 devices and if you should ever need to replace the remote, it still allows you to just go to Settings and replace it as the remote for your system. In addition, all previous models can be copied to the new software and copied when changing the model of remote, with the exception of the H1000, which A) didn't use a compatible operating system and B) didn't work for long, so there was really no reason to bother. For anyone who has an H1100 and wants to switch to the Elite, do it. The side buttons can be created easily on the touch screen and renamed.