The A52 is a pretty good sluice and it's what I use. I use a modified A52 with Sunstream riffles (better recovery, as the riffles are not only lower, but there are more of them - never mind that it looks like some sort of giant cheese-grater) and a square of miners moss below the slick plate. A52s are good sluices if you want to only large classify and they will handle anything up to 1/2 an inch and do very well on anything classified to 1/4. I've seen people do crazy things with A52s (like shoveling dirt clods and cobbles into them and even running them sideways) and they still catch SOME gold.
That said, you can get a LeTrap for $15 to $20 less than the A52 -
http://armadillomining.com/cgi-bin/ccp5 ... ConversionThese have a much better recovery than the A52 due to having short riffles, BUT - they are very finicky about the water flow and their real disadvantage is that you need to classify down to at least 1/8th. They also have a tendency to load up quicker and require more clean ups, but that's not a big deal when there's no riffles, expanded metal, carpet, etc. to remove and you can just wash it off into a bucket and put it back in the creek.
If I had it to do over, I would have started with the Le Trap, just because of the ease of clean up and shorter riffle.
All things being ideal (classified material and proper water flow), the Le LeTrap has much better recovery and will catch a higher percentage of that itty bitty river gold like you find in the Rogue, Illinois and South Umpqua.