I am having a lot of fun with this simple to fly little jet. For freeware it is very well made. The Viper engine is very powerful so you will encounter over speed issues if you do not power back well before your target speed.
Practice level flight trimmed out at 150kts at about 1000 feet above round level ant note your power setting. Mine is about 7500 rpm. If you are learning to fly knowing you power settings for certain situations is a must. In the climb I reduce power to 8000 rpm at a pitch of about 10 degrees I then adjust the pitch until I get 150kts...... Then trim.