As for the problem I illustrated above, I've had some difficulty reproducing it consistently.
 
I normalized the sample to 0dB so the limiter would engage with the attack gain at zero. SONAR shows the limited peak value at -0.1dB. But after bouncing, the peak is -1.6dB. There does seem to be an inconsistency between playback and rendered clips.

bitflipper
I've been methodically comparing TransReckon to similar products and honestly, it ranks among the best of them. One of the strengths of this plugin is the ability to adjust sensitivity and duration for attack and sustain phases separately. It excels at bringing up drum sustains and ambiance, even if that's not what people use transient designers most often for. 

 
Thanks again for your feedback!
 
I did some tests but cannot reproduce the limiter issues (my specs: Sonar X1 Studio x64 - buld 185, RME HDSPe AIO, Core i5 IvyBridge, Windows 8).
Thinking it could be a samplerate issue, I performed these tests at 44.1kHz and 96kHz (but both gave the same results).
Here are the results (without the limiter, I can reach at least +6dB in this situation).
 
-> -0.0dB

 
-> Export to wav from Sonar (-> almost 0dB)

 
Could you please tell me more about the artifacts (or eventually post an audio file)?
I may have missed something but the limiter seems to be quite transparent here (it is based on BW-LIMIT87).
 
Thanks again!
Best,
Philippe
 
 

I'll see if I can get a recording of the artifacts, but it's intermittent and I haven't figured out how to reproduce the problem consistently. If I do manage to capture it, I'll email it to your support address.
 

Many thanks, Bitflipper.