I'm in the process of replacing my BMA EFIS/Lite Plus Gen 4 with a GRT Sport SX EFIS right now. I already had a GRT EIS engine monitor, so going GRT was kinda logical. Since my BMA had Synthetic Vision, I wanted that option on a new EFIS and the new GRT Sport SX was purchased with that option. Looks like it is going to be an upgrade rather than just a replacement, which makes me happy!