used a phillips hadco 600w last week, and did a few tests and thought I would share my thoughts. I purchased the 12-15v unit from my local Ewing irrigation distributor at a cost above what I have been paying for garden light 600w and a few others, it is about the same as copper moon and most jefferson clones, and less than fx, gambino, and other higher end 12-15v trans. This unit feels different than a jefferson unit, but I am not sure who truly manufactures it. The photocell that can be purchased for the unit has a slightly different plug and was about 20% less than I have paid for other units. unit comes with photocell bypass plug and photocell came with cap. I like the getting the cap, many photocells don't come with them. It is UL listed and canadian UL listed. I failed to write down the number of the listing, But I know it is UL rated for wet locations according to the website. The case is a bit smaller than I am used to for the jefferson clones, not quite as tall, and felt slightly less wide and deep. the area for wiring felt adequate, but I only fed 4 wires into it and that is usually easy on any unit. stainless was a heavy guage, felt expensive and has nice raised hadco label on removable door with strong clasp and no screws to deal with. stainless door came covered with typical sticky plastic. lockable on clasp. 1 1/4" hole for threaded pvc male adapter, that one has plastic knockout, 4 other dual 1/2and 3/4 knockouts that are stainless. door has insulating gasket. edges of main knockout of 1 1/4" and 1/2" photocell were dulled, not much danger of finger cuts. others were true knockouts and did not test those. negative- unit only has one mounting keyhole on the top center of the unit. I would prefer 2, even though the unit only weighs around 25 pounds. It does have a centering leveling screw rest on the center of the bottom, and I utilized that as well. I would definetly use 1/4" tapcons for only one screw to hold the weight. pro-rather than using a split locknut for the photocell or a drilled side locknut, somehow the plastic photocell connector that hadco uses allows a normal 1/2 locknut to go over it. no worries if you drop it in the grass and lose it . secondary circuit breaker switches are located at the very top, which is another reason why I think someone else other than jefferson makes this. nice thing about top location is the internal cord for the timer never accidently turns off a common tap. pretty sure this is a magnetic unit and not torroidial, but I noticed no hum at all at the low load at the installation site. The 12-22 volt version is torrodial and...heavier? comes with seperate loop to test amps on primary, so you can test true load with photocell cap on. measured unloaded voltage at taps on 112 volt imput voltage: 12v - 11.45 13v - 12.55 14v - 13.6 15v -14.5 amps on loop unloaded with either or both commons on: .35 amps commons off unloaded: .2 amps taps loaded with 180 fixture watts, split between 2 commons ( 9 fixtures ) 12v- 11.35 ( no wires ) 13v 12.4 ( 3 wires ) 14v 13.45 ( 1 wire ) 15v 14. 4 ( no wire) primary imput voltage dropped to 111 v under load. lugs held 3 12g wires easily, probably could easily do 4, maybe 5 or 6 with patience. primary loop amp reading loaded 2.45. max rating label is 5.5 amps ( I am used to 5 ) or 5.5*120 volts is actually 660 watts. this may be a typo, but hadco also lists that on thier website. given the low load the .1-.2 drop was about what I would expect from a good magnetic unit. I have seen similar drops from a torroidial units however. I know this is a low load and not really a fair hot rod like test to see what they can do. I will use a few of these and load them higher on future jobs to see how they turn out while I could have purchased a 300w hadco unit and pushed it harder than the 600, the homeowner wanted to add some tree lights and also some additional house lighting in the future, and I wanted to give him options. I also seem to rarely install 300's these days. I am not sure if I have put in one all year. overall, at least for low loads I am currently impressed with the hadco unit. Phillips/hadco offers a limited lifetime warranty on the unit, but I have no experience with thier warranty service, so I am not sure what that means. I got no real info on the warrranty with the paperwork, and I dug through the hadco website and found nothing.