Madded MJ's were around way before the hydors came to be. I like the MJ's as the flow is more directional. Those kits seem decent for the price. I run modded MJ's but they were done before kits were available.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,