There are appearing new sites in the dating world even more frequently now than before. The niches that are being targeted are also becoming increasingly specific. Soon there will probably be a dating site for almost every interest we can think of. This phenomenon brings with it both positive and negative aspects.
On the positive side, it's often easier to find someone we like when we both share the same interests or have something else in common. So meeting other singles through these niche specific dating sites might result in a better chance of finding a long term relationship, or at least meeting someone we are able to get along well with.
On the other hand, because of the specific group of people that these sites cater to are smaller than are smaller than that of a more general dating site, the user base will most likely also be smaller here. This means that there won't be as many other singles to choose from.
Ultimately, it all comes down to your own preferences. Is it important for you that your partner shares the same interests as you? Or would you rather choose from a wider variety of singles to find someone who matches your preferences?