I have the TX200 and have shot my friends 97. Both have tune kits now. Before the tunes they were accurate and both had some spring noise, the 97 more so then the TX. After the tunes both guns are still accurate, noise free and much smoother to shoot. The TX is easy to work on but the 97 is not. If you are going to play with the internals as most of us do the TX is great for that, the 97 not so much. Both the 97 and the TX are great guns and nice to look at. I have no experience with LGU, looked at it but parts seem harder to get then the other 2.
Hope this helps.