Opinions on CO2 injection - e.g. Jungle Fizz Factory or DIY?

Hello, it's me again with more questions! Thank you so much for your
help and advice so far -- this is the most open and friendly newsgroup
I've ever participated in. =)

This weekend I'm going to set up major CO2 injection for my new
tank--55 gallons, planted. It was going to be partially planted but
now I think the fake plants look horrible compared to the real thing.

Some of the plants have brown leaves already, though, and since they
have fertilizer and ~3 watts/gallon of full spectrum light, CO2's the
only deficiency I can think of (per this newsgroup's advice).

I think I can make a fairly aesthetic DIY kit, but I could buy two
Jungle Fizz Factories (supposed to be good up to 40 gallons) instead.
More aesthetic, more expensive.

Does anyone have experience or opinions on this?

Thank you!
Jamie