I have had my Safari now 2 1/2 years, and I am still very happy with it. I also have the latest edition of the Safari book. If you want to get the most out of your safari get this book and read it several times.
Now for the down side of the Safari I as see it.
1. Weight....A sling or bungy type harness will cancel out the weight.
2. No backlight....I wear a headlight in the early morning hours.
3. Slow response time... You gotta go slow with a slow swing, that's 4 seconds left to right back to left.
4. The control box is only good in light rain....Use a environmental cover, also keeps the screen from getting scratched up.
As for the 600 or 800 there are just as many thing I don't like either
1. Battery is not user serviceable...you gotta send her in to get it replaced.
2. Battery's short run time about 9 hours....(I get 40 hours on the RBN rechargeable battery in my safari).
3. Cable wrapped around the shaft, and the unfriendly shaft length adjustment. (I adjust the shaft length on my Safari sever times during my hunt to accommodate the ground conditions).
4. Waterproofing is 10 feet for 1 hour....If your out in breaking surf that is not the type of machine you want(in my opinion), get an Excalibur instead.
Now if I was out to buy a new detector and had never own a Safari, it would be a hard choice between the the 800 or the Safari.
A Lot of people are driven by price. I prefer to go by features, and then to try and get the best deal I can.
Decide what features you really gotta have and get that machine.
Speed, lightweight, backlight = 800
Deeper, more coil choices, battery, shaft adjustment, no exposed cable to get snagged = Safari