I came across to these Boomers just as an experiment with different string gauges trying to find the best and comfortable for me to play. Because I mostly play in lower than standard tunings the first criteria was to find not very thick gauge strings but that could make good tension with quite low action on my guitar.
I normally tune to standard A or Open Cmin9 with low G they stay relatively in tune for all the string bends I do when play guitar. It is also handy for those who are hard picking player as I try to be.
I find that these strings to be quite loud, which is good if you need more output of your guitar. Personally for me, as a metal player it works great. Of course this will not replace Tube Screamer in your chain but definitely will give some small extra boost and sustain to tone. Also they sound expressed mid range.
To sum up I can say that this is a great sounding set of strings for less than 8 EUR with gauges that suits great for lower than standard tunings. It is a good sounding strings that won?t sting your wallet. Even if you are fan of different string brand this could serve as great spare string option.
The only disadvantage that I would mention is that they not last long as I would love to. Maybe only in my case it is like that because of my sweaty hands, but taking into the account the price, nevertheless they worth its money.