APR used to do a 6 hour trial tune (though you'd need to check if this is still the case). After that it will then revert back to "stock" or an "APR" stock.
The problem is that your ECU needs to be taken out and flashed on the bench. There is a reasonable amount of work in doing this so what is usually a "free" trial/demo (if they can flash it over OBD port) will usually end up costing you some workshop time.
The other thing you have to keep in mind is that (and you'd have to confirm this but I've heard from a reliable source) that the ECU then becomes "locked" to APR tunes and means that other tuners are unable to read/write the ECU.
Which is OK if you want to try before you buy with APR, but if you then want to take it to another tuner you may have issues.
So I suggest that you do your homework and decide what you want. Most people that get the tunes done on a 125/132 say it's a massive difference and the best bang for your buck. So if that's what you want then I'd get it done.
There's a few other tuners out there but they will definitely need to take your ECU out and do a bench tune which does limit your options.
Having said all that APR are a reputable company with good back-up and support. There are quite a few Tigs with APR tunes running around so I'm sure if you went that way you wouldn't be disappointed.
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