Great product as an intro to Warhammer 40K. Small, economical, suppliments existing sets, and good for an introduction to miniature modeling/painting. I had bought this for myself and my kids (teenagers). I used to collect and paint, and my kids said that it might be cool to work on them.
Quality: Hardly any mold flash, reduces amount of work to trim excess plastic. 'Snap-on Variety', doesn't require glue but glue would be advisable if you touch the figure regularly. Detail is great, enough for visual appeal but not too much where it would be difficult to paint. This is based on my experience that includes a knight that had demonic faces carved into all segments of the armor. The breast plate alone had 6 faces detailed into it.
Newbie: Due to the price of this item compared to the larger sets, try this product to see if this hobby is for you. You won't have much invested, you can make mistakes with painting or experiment. You can also experiment with the table top rules to see if it right for you. I'm new to 40k but it looks comparable to the D&D Miniatures. I have enough to decide whether or not I want to expand the figure collection or use these as decoration.
Experienced: You can bulk out some of your units. For example, max out the number of marines in any squad or have them support a heavy weapon or vehicle. Ideal cannon fodder to flush out and flank entrenched units or position them in fixed fighting positions to protect important objectives.
Cons: 1) Quantity, it would be nice to order batches of these figures so you have the option to build a squad or platoon quickly. With the addition of a sergeant and a single heavy bolter and flamer, you have a viable assault force. 2) Shipping and Handling, it would be nice to have more options since I spent the same amount for shipping as I did on the figures. I had ordered several other faction start sets to offset the cost. I would have given it a higher rating if this wasn't a factor.
I'm hoping my kids get an interest in modeling. I know it kept me occupied safely and out of mischief. Many years later it still retains its 'coolness' factor.