Great place to grow!
As far as retail goes, Healthy Planet is one of the best places in Ontario to work. That said, it is retail, and some people will simply never enjoy retail.
The ongoing education provided for Nutritionists/Product Specialists is exceptional, I learned far more simply working there than I ever would have at a continuing education course in nutraceuticals, and was consequently better versed in nutraceuticals than many Naturopathic Doctors I know (and continue to educate them on products). It's advantageous that the education isn't bias, you receive an honest look at all product lines and can guide customers with integrity.
The pay is somewhat higher than other retail positions, but it is still not great, especially considering the cost of living in the GTA. That said, if you are willing to put in full-time hours and show initiative, opportunities to grow within the company will certainly present themselves. There is a great benefits package offered to full-time employees.
Each manager is different. My first manager was amazing--very helpful/supportive, extremely knowledgeable, organized, efficient, and pleasant to be around--I couldn't have asked for a better boss. The second one was not so good...
The atmosphere is calm and work was enjoyable. If you are interested in health, don't mind retail, and want to grow with a company, it might be a great fit for you.