In reference to not seeing a bowflex in a gym so it doesn't work. Not an intelligent statement. (Thats not meant as an insult its just my opinion.)
When you go to a restaurant do you see the same type of range or oven you have in your house?
When you take your clothes to the drycleaner, do they press your clothes with the same kind of Iron you use at home?
The range at your house works just fine though.. right?
And your clothes look just fine when you use one of those little hand held irons don't they?
I have a bowflex and it gives you a great workout.
The secret is in order for it to help you, you need to <B><U>use</U></B> it. It doesn't help you if its stuck in the corner of the garage collecting dust. (I learned that by experience)
I have not touched a free weight in over 6 years but use my Bowflex on and off. I work out chest with between 180 and 220 lbs on the bowflex 6 to 12 reps / set. Out of curiousity, I was at my sisters house and her husband has a weight room so I wanted to "test" and compare the difference. I put 185 and snapped it up a few times with ease. I put another 40 lbs on to see what 225 felt like and I put it up 8 times.
I also tried it with dumbell curls. I use between 40 and 50 lbs / pulley for curls on the BF. I grabbed 45 lb dumbells and did 10 reps of alt curls. So in comparison, I say the bowflex will indeed give you a workout similair to that you can get in a gym. If your into powerelifting it may not be the right answer, but for most everything else it will get the job done.
Just my $0.02.