I like the elementary OS terminal emulator quite a lot and I'd love to have it on my main machine, which is running Ubuntu 15.04 Vivid.
Is it possible without compromising Ubuntu's stability?
yes you can do that , you can install it by running:
sudo add-apt-repository ppa:elementary-os/daily
sudo apt-get update
sudo apt-get install pantheon-terminal
download the source code from https://launchpadlibrarian.net/203448637/pantheon-terminal-0.3.1.1.tgz
Now extract the compressed package:
tar xf pantheon-terminal-0.3.1.1.tgz
To compile it:
cd pantheon-terminal-0.3.1.1
mkdir build
cd build/
cmake .. -DCMAKE_INSTALL_PREFIX=/usr
make
To install it:
cd build/
sudo make install
cd
command is not necessary.