here is my opinion because i have got into a couple arguments about it in the past. i have had maybe 10-15 different odyssea fixtures. from pc/t5/MH, ect.
here is my opinion on there stuff....
PC fixtures- fine. just like any other fixture. bulbs sucks and need to be replaced as soon as you get them, the white is a 12k and soo overpowered. you cannot see the actinic bulbs. but all and all, if you want a PC fixture (no one does anymore so who cares) then its great. i prefer them for planted freshwater tanks though because of the stock color spectrum of the bulbs.
T5- everyone is going with t5 now a days. and they are right, t5 is a great cheap way to go. i personally have t5 fixtures. ill be honest, there t5 fixture is great. just like any other out there. the bulbs, well again i reccomend replacing with Geismann, KZ or ATI. your ONLY downfall... the reflector is one big reflector. individual reflectors are SO much more important and better then one big shiny piece of metal behind your bulbs. but besides that its all the issue i have with them. i also do wish they kept the flip up legs they use to have.
Metal Halide Fixture- well, look, this is the fixture everyone says OHH ITS A FIRE HAZARD. blah blah blah. look, if you read about any of the fire issues this fixture ever had, it started from the ballasts. the ballasts either got wet, did not get enough oxygen near them, or overheated. since this issue, they replaced every fixture ballast about 2 years ago now. they have never had this issue since the ballast was replaced. and now, about 4 months ago they replaced all their fixtures on their site 100%. new shell, new ballast again, new thicker reflector, new wiring harness, new leg set up, new hanging kit, new everything. the price changed a bit but to be honest with you they did a... OK job. they are nice, real slim looking, but simple. its a very simple set up. i had not the new set ups, but the 36 inch metal halide with 4 39w t5 bulbs and leds. the fixture was fantastic! the stock bulbs well sucked and i put a phenoix 14k in and D&D bulbs and it looked amazing. did not get any hotter then any other fixture and those exturnal ballasts actually did not get hot at all! i loved it. no complains except it did not fit on my tank correctly because my tank is only 12 inches wide and the fixture was 14 inches wide so it was a bit wide, but thats it. i loved it......BUT i sold it and got a TEK light. it was my first metal halide fixture, and i gave it a shot, but it was just not for me. i just love t5.
new LED strips- no experience with them, but look kinda cheap. almost like wal mart style LEDs for your car or something...
i also have experience with their products if you think about getting any products from them as well...
again, this was all just my opinion...