Good to know....I've been tempted to get them, so I can put off getting the airbrush kit longer....
Thanks!
Since I don't do cakes on a regular basis (and in fact, will be retiring soon....watch for online rummage sale! LOL) I use them. You do have to be careful and OH MY GOODNESS the SPRAY FACTOR! LOL I have to practically clean the CEILING at the church kitchen when I use them! I'm SURE it's not the operator's fault! LOL
Keep on Cakin'!!
Beth in KY
I don't have an airbrush kit yet and I use them alot. I haven't had any trouble and the cakes always turn out very good. 
i needed a black tint on a cake, tried wilton's............was terrible. i was very dissastisfied. tried 3 different cans it didnt work. maybe it was the black color, will never buy it again.
I've used them fairly successfully. The trick is to make sure you don't spray them too close to your object or cake. Nice smooth and light sprays work best (I practiced on paper to get the feel of it and the look I wanted). You'll have to do a few layers to achieve deeper color. It works best on really smooth surfaces (like gumpaste or very smooth buttercream). I'll agree with what I'm reading here about the sputtering and splotching, but just make sure you wipe the spray nozzle off frequently and you'll find that doesn't happen as often. The blue color on the top of this cake and the starfish were both colored with the Wilton spray color. I actually layered yellow and red sprays to make the starfish color and I was happy with the results. Then I made the dots with gel color thinned with vodka. It's definitely not the precision of an airbrush (definitely cover any surfaces around what you're spraying!), but if you're not in a position to buy one, it makes a decent alternative. Like an airbrush though, practice helps! Good luck!
I've used them with buttercream and they have done quite good.
I used them for the first time on this cake and was fairly pleased with the results--I still want an airbrush though. I also used the spray on my beach scene cake and layered the colors to get a deeper blue contrast between the sea and the sky--also in my pics right next to this one! I covered eveything in the surrounding area with newspaper before spraying though!
http://www.cakecentral.com/cake-photo_1264889.html
I have used them a number of times because I don't have an airbrush and I think they work okay. I agree with all the previous posts about how to use them. You do have to do it in layers to get the color you want and it helps to cover the area around the cake when spraying. As I'm not an artist, I am always nervous about using the sprays that I might do it wrong, but so far the cakes have looked pretty good...at least I think so.
I have used them a number of times because I don't have an airbrush and I think they work okay. I agree with all the previous posts about how to use them. You do have to do it in layers to get the color you want and it helps to cover the area around the cake when spraying. As I'm not an artist, I am always nervous about using the sprays that I might do it wrong, but so far the cakes have looked pretty good...at least I think so.
I used them on this cake, and was satisfied with the results...as others say, they do sometimes spit and sputter and COVER the surrounding area 
http://www.cakecentral.com/cake-photo_1270501.html
Mencked, just wanted to say that your borders on the August Birthday Cake are beautiful!
And CristinaB your Beach Cake is lovely! I can't believe you used the spray cans on this cake.
I did a whole cake green with the spray one time, did take forever to dry and never really completely did. at the party the kids had green hands and faces 
i decided i would never do a whole cake like that again. but the sprays do work really good for making highlights or tips on flowers
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