I've held a SIRT, and personally, it isn't for me at all.
I spent a couple hundred bucks on an airsoft replica of my competition gun, but at the end of the day, that gun doesn't weigh or balance the same; the trigger is different, sights are different, "recoil" is different... it has been in the box since about 2 days after I got it.
I have no desire to try any faux-gun again.
The laser-light type systems intrigue me, where you have a laser cartridge that sits in the actual chamber of your actual gun and is activated by the firing pin. It takes a special kind of target to record the hit and show you where it was. I think this might be mildy useful especially for a newer shooter as they are working their draw speed down for the first time, but even then, I wouldn't spend a bunch of money on it (anymore).
You just need to spend enough time live firing to develop solid shot calling ability, and then you won't need any gizmos to do so in dryfire.