I owned the Solo S2 for about 2 years. Now I bought the X50 because I heard it was better than the S2.
After using the X50 for a week, I noticed that it does not pick up signals as strongly as my Solo S2. While the Solo S2 picked up the X and K band signals VERY early, and with a strength of 6 (max), the X50 only picks it up as it drives by with as signal of 3. The S2 picked up a speed detector sign used by cops 0.9mi early using X band, but the X50 only picked it up about 0.5mi early... I thought that the X50 is supposed to be better?
Solo S2 sounds a LOT better and looks a LOT better too. The display on the S2 is amazing. The sounds are so different for each band and the laser sound is awesome. I don't like the X50 sound that much. The K band chirp is very harsh.