When comparing the SDS and 436 on my local P25 simulcast, setting the SDS to 2 or higher caused either a significant delay or complete miss of many transmissions that came through on the 436 just fine (which was set to 1). Setting the SDS to 1 gives nearly identical performance, with the edge to the SDS (apparently, conditions are way above average for the 436 to be doing so well - but I'm sure it'll go deaf once again any day now).