I have used the response trigger on an A5 and once it is set up right you can get the trigger to bounce against your finger and it is almost as good as an electonic set up. Plus side, no batteries or delicate electronics to worry about getting wet, negative side, the marker uses slightly more gas and the small seal between the removable handle part and the marker body can get damaged if you are not careful.
Personal choice, response trigger evert time on this marker.