If they do burst into flames it would be wise to never leave one running unattended either, better still bin it and get a decent one.
Are these compact Xantrex/Sorensen XPD 60V 9A PSU's any good? I bought this one to eventually replace my cheap Rapid Electronics one and provide a higher voltage range, I did briefly have the Xantrex version but it was DOA (stuck in current limit), thankfully the seller was able to replace it with the Sorensen one, which is indentical apart from the output terminals/binding posts.
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David
Personally I wouldn't give it bench space, it is just such a crude unit, doesn't even support a fine and a course adjustment on either the current or the voltage sections.
Like mnem says you are better off with a far higher quality unit, but and here's the rub, I fully expect that even with a top flight unit such as a TTi etc there is always going to be a possible failure mode that could result in damage to the DUT, nothing and I mean nothing apart from using batteries to power the equipment, could result in an over voltage situation in the event of a failure occurring, so its best to never leave anything connected to power supply unattended. 
The Xantrex/Sorensen unit does have multi-turn voltage & current controls.
It's got to be slightly better than the Rapid Electronics unit (I seem to be lacking in pictures of that), which only has single turn controls, plus crappy hard to see LCD's and the binding posts are shit too.

If I had space I would have something like a HP 6274B under the bench.
David