If you would like the safety net of having a device that is virtually unbrickable then you may want to consider generating nvflash blobs for your OG Nexus 7, or any of your other Asus Nvidia Tegra devices. Blob files can be used to get you out of ugly situations when you aren't able to boot recovery. Flatline creates blobs for the OG Nexus 7, Transformer Prime, TF300T, or TF700. A custom recovery image flashes a custom bootloader to create the appropriate blobs. Blobs can be retrieved from /tmp/androidroot. Rayman has created a guide which will walk you through the entire process. His guide is at the source link below.
I would highly encourage you to take the time to create the nvflash blobs for your device. Last year i flashed the wrong recovery to my Transformer Prime. This made my device unusable. It wouldn't boot android, and i couldn't even get it to boot a recovery, if I had created the blobs for nvflash I would have been able to save my Tprime. Instead I ended up selling it on ebay for scrap.