@Jacie I might be late to respond, but, my two cents on Slatkin..
I've been a fan in the past, and purchased quite a few. I haven't in the past 3 years purchased any real candles, since painting my condo...don't want the soot anymore, which did accumulate on my walls and ceiling fans, over time...I believe from many burning candles and one or two issues with my fireplace backdraft (don't burn that anymore either.)
That said...here's my expeience. His fragrances are wonderful, accurate, lasting at least half-way down....sometimes after that I smell them a little less. They also burn evenly and no accumulation of wax along the sides of the jar, like with Yankee Candle or some others I've used.
What I didn't like at all...extremely sooty. Which is what they advertise they shouldn't do, but for me, mine did...the sides of the glass jars got very sooty, so I knew that soot is going into my environment. Also, I don't believe his are soy. If they are, well must be still something causing soot.
I recently did a lot of Google searching and reading up on ratings of "good" brands of candles, environmentally clean etc, vs. brands that rated low. Slatkin was in the latter category on these lists.
IF I ever burn any in the house again (I still burn them on the porch and occasionally in the kitchen which has yet to be revamped and painted) I'd buy some of the other brands I saw when I Googled.
Good luck deciding...there are many high end, environmentally conscious brands out there everywhere now...pricey, but some I've seen in boutiques smell delightful. Hope this helps!
PS. This year I've switched to wall plug-ins for fragrance, and also have used fragrance sticks in the past too...been working nicely, and cleaner.