Yeah it's definitely a potent substance, arguably not something that should ever be used on a recreational basis considering it has practical uses as an elephant tranquilizer and a chemical weapon. I actually ended up with it by chance not intentionally, I was trying to get Oxy and the friend I was talking to was like hey here's some Carfent instead. Bit of a jump I wasn't really planning on taking. I won't touch the stuff right now because my opioid tolerance is at an all time low I'd bet any amount would kill me, but I'll keep it around for if there's ever a time it may be manageable on a veryveryvery carefully dosed basis.
I adore regular fent, I actually like it more than heroin which is what led to me experimenting with fent analogues. It's definitely something you have to be more cautious with dosing, there's a pretty thin line between getting high and making yourself extremely sick or even falling out. But I find it much more euphoric which makes it pretty desirable in my book. Has about the same rush when IVd, only downside is the high only lasts about 45 minutes vs the multiple hours you can get out of a dose of H.
looking to get a gram of meth, a gram of heroin and 10 drops of liquid lsd soon though! 
