On a personal level, I strongly believe that one can benefit much from personal training, especially if you're a beginner. Then again, some people may say that my opinion is biased as I'm a trainer myself

You should get opinions from those who have experienced being a client of a trainer.
But you should be careful if you're in the market for a trainer, as there are many self proclaimed trainers who are not certified, OR they are certified by unknown certification bodies with 'glamorous fitness company names'. Also, while in house certification gives a trainer basic knowledge of how to be a trainer, I dont feel that it's sufficient.
Gyms usually have trainers with varying abilities and certifications, so do your window shopping and research first. There are also independent trainers in the market - they are usually better in terms of certification and experience (which is why they can 'survive' or thrive working alone instead of being tied up with corporate red tape). Best of all, they travel to your location
Hope that helps. Lemme know if you want more details.
Cheers
-sharm-