I have had both the 305 and the xp3 side by side for a month to test them out together. I chose the XP3 and have had no issues. My only regret is that I bought it before Foster and Smith put it on sale for $110. If you type CK-907364 in the search field you'll see it for that price, rather than the $180. Hope this helps you in your search.

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55G w/
(5)Tiger Barbs
(6)Black Phantoms
(5)Glowlights
(2)Neon Dwarfs
(2)Honey Gouramis
(1) Vail Angelfish
(1) common Pleco

Plants
(8)Amazon Swords
(4)Micro Swords
(4)Red Ludwigia
(2)Anubias Nana