I like the lift chairs from Golden Technologies or Pride - both are available at US Medical for about the lowest prices you'll find. Also, US Medical has a really good customer service department. I'm not quite as familiar with the Pride lift chairs as I am with the Golden chairs. The two companies are actually located almost across the street from one another in Pennsylvania, and both are extremely well constructed (in the USA) to last for a very long time.
I highly recommend the heated massage option. It's not the harsh kneeding type massage, it's just a gentle vibration-type massage, but the heat can be absolute heaven on an aching back.
The "zero gravity" design is really just a fancy name for the seating position. It really just means that, when you recline your lift chair, your heart will be even with the rest of your body. I don't think there's any scientific benefit to this, unless you plan to take your chair into space, but supposedly, your heart doesn't have to work as hard to pump blood to your head or your feet - hence the "zero-gravity" name for the position. Again, it's really just marketing non-sense, but you may find it to be beneficial. Regardless, that position is very comfortable and I've fallen asleep in it numerous times.
As for comfrot, these chairs are Cadillacs. Enough said.
Golden can put a fabric on their chairs, which I highly recommend, called Brisa. Get it. It's about $200 more, but it is a breathable, leather-like, suede-like material that can be cleaned with a mild-bleach solution (yes, I said bleach). If you or your loved one has accidents from time to time, this makes it well worth the $200. It's not hard like leather or vinyl, but very soft to the touch, very durable and it breathes, so it's not hot like leather either.
If you're unfamiliar with lift chairs, they are the must-have chair for someone that has a difficult time getting up from a seated position - especially after watching TV for a few hours. The chair has a motorized lifting system that gently and slowly lifts the chair into a position similar to the one shown above. From this position, the senior can usually just stand-up. Since the arms of the chair are higher also, it helps them remain stable once they get to a standing position.
To sit down, the chair is usually left in the "up" position, so the senior just reverses the process into a seated position, and then most models can continue into a reclined position. As I mentioned above, some models will even continue reclining into a 'zero-gravity' position which puts you in a great position for a nap.
The idea is that a senior can stay in their home longer if they don't have to worry about getting stuck in their chair, or fall when they get up from a chair. Yes, buying a lift chair is expensive, but consider the cast of a nursing home. The lift chairs usually cost less than 4 weeks in a nursing home. If a lift chair can help keep you or your loved one out of the nursing home for a few months, then it pays for itself several times over.
Click here to learn more about buying a lift chair.
I hope this helps!
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