I analyzed data for 4 sessions.
Two sessions with Sony sensor (drill sessions) and two sessions without Sony sensor (one round robin and one double match).
Too early to tell everything yet since I only have data about 9 hrs total.
I will start with two sessions without Sony sensor.
My average swing speed for round robin was 35mph forehand (max speed 64mph), 38mph backhand (max speed 92mph) and 57mph serve (max 71mph). For double match, 35mph forehand (max 56mph), 36mph backhand (max 55mph) and 56mph serve (max 71mph).
I understand that swing speed might not be same as practices since it's match situations so I might took off some speed for consistency but it's a little slower than I expected. Also there is no way I can hit 92mph backhand hahaha.
Two sessions with Sony sensor
For an hour and half session: Average 42mph forehand (max 64mph), 45mph backhand (max 60mph) and 56mph serve (max 67mph)
For one hour session: Average 43mph forehand (max 72mph), 42mph backhand (max 56mph) and did not serve.
Data shows a little faster swing speed but still slightly slower swing speed.
Comparison between pop and Sony sensor
Pop recorded
Playing time:1:33
Shots 212
54 forehand, 62 backhand, 32 serve, smash 7 and 57 volley
Sony sensor
Paying time:18:59-20:32
Shots 214
54 Topspin Forehand, 2 forehand slice, 68 topspin backhand, 3 slice backhand, 34 serve, 11 smash, 19 backhand volley, 23 forehand volley.
Pop
Playing time: 00:55
Shots 229
129 forehand 44 backhand 6 smash 50 volley
Sony sensor
Playing time: 18:55-19:49
Shots 258
118 Topspin Forehand, 3 forehand slice, 46 topspin backhand, 1 slice backhand, 4 serve, 13 smash, 27 backhand volley, 46 forehand volley.
Both devices recorded accurate playing time. It showed a little different data but both devices can't be perfect so I will give "acceptable" rating on total shot count.
The first session data showed almost same total count of shots but the second session data showed some differences which is derived from the volley.
Sony sensor often mixed up forehands to smash or serves when backswing has certain angles so smash and serve count can be mis-calculated but it's pretty accurate when it comes to total shot count. Sony sensor filters well for false bouncing balls such as bouncing ball during serve or little taps with rackets.
Even though there was a little bigger gap for shot counts in the second session, I will rate "Pop" as "acceptable" rating
But still need to explore more when it comes to forehand and backhand swing speed data.