A friend of mine has the JetBoil system with Group pot and Individual pot and coffee press. Four of us used his on the trail for a week a year ago and I had to have one. I have some critical things to say about the JetBoil Group Cooking System - it isn't perfect, but I wanted this system anyway and my daughter gave it to me for Father's Day this year. I have used it on the trail for two one-week trips this year and it is my favorite backpacking stove of all time.

I used liquid fuel stoves for 35 years and resisted the move to propane. The intense heat from a gasoline stove and the roar of the "jet engine" always made that seem the way to go to me. The contrasts of propane and liquid fuel stoves is striking. With the gasoline stoves, starting is a challenge, with pumping, and getting liquid fuel out in a spill cup to light to heat the generator to finally start the stove. Then, my MSR was always either going full blast or going out. There was no simmer without continuous adjustments. Propane lights immediately, allows a full range of control of intensity, and immediately goes out when you turn it off. I understand there are issues in extreme cold with the fuel cannisters maintaining pressure, but I quit doing winter hikes many years ago. 

The JetBoil stove is very fuel efficient. It heats water quickly and it provides extreme flame control for simmering or browning. And it is easy to light from a match or lighter even when the pizo sparker isn't cooperating (about half the time).

The 1.0 Liter individual "pot" (more like oversized mug) is adquate for heating a small amount of water. With the optional coffee press it will make a decent cup of coffee for 3, just be sure you have fresh coffee ground large for a press - fine grounds can sneak right through or around the press. And the grounds rinse out fairly easily if you do it soon after finishing off the coffee. By the way, they "fill line" is about 2/3 of the way up for a reason. With the vented lid in place, when boiling begins it can vigorously spew steam and scalding water out the top if it is filled much beyond the fill line. This makes reaching the flame control an interesting proposition since the 1.0 Liter pot does not just rest on the stove like the 1.5 Liter does, the overgrown mug is attached which is great for fuel efficiency but does not allow quickly taking the pot off the stove before turning down the flame. Ah, the voice of experience.

The 1.5 Liter pot is intended for group cooking. I suppose if all you need is to heat a quart of water to rehydrate freeze-dried foods, then it is all you need for a small group. I don't do freeze dried any more. We dehydrate our own foods and actually cook in the pot on the stove on the trail. This pot is too small to hold a one-pot dinner for 4. So we take along a larger pot and wish we had the ingenious heat sink on our big pot so we could maximize the efficiency of heat transfer and avoid the hot spot in the center of the pot we get using the inexpensive light-weight 3 Liter pot from WalMart directly on the JetBoil stove. We need a 3 Liter pot made for the JetBoil stove.
 

PROS 

• Easy to light
  
• Good flame control (very fine adjustements and immediate response)
  
• Excellent fuel efficiency (less fuel to carry)
  
• Packs and stores well
• Lightweight stove
• Covers keep in heat when off the stove
• side insulation of pots is removable for washing
• Coffee press works reasonably well - get coffee ground bigger (not as fine) than for your filter coffee maker

Cons

• Small capacity - 1.5 Liter is biggest pot/pan available
• surface isn't really non-stick - can take some scrubbing to clean
• propane doesn't work so well in extremely cold conditions