Instruction: Carefully assess the user's review for any strong expressions of sentiment, either positive or negative. Based on your analysis, select the most fitting sentiment option from the provided list as output.

Input:
EASY TO INSTALL; EASY TO USE

ADVANTAGES

I really like being able to quickly attach and remove my snorkel.  I find it easier to attach the snorkel with my mask on first because my head keeps the mask steady.  It's also seems easier to get the snorkel lined up with the mask properly.

I also really like being able to leave the keeper on my mask and then store the mask in its original container.  The keeper is small enough that it doesn't interfere with storing your mask in any small space or small bag designated for the purpose.

I have multiple masks, so I purchased a keeper for each one of them.  That way, I didn't have to move the keeper back and forth between masks (and risk forgetting to move it to the other mask).

When scuba diving, I've come to dislike wearing a snorkel while I dive:  current, stingrays, and other divers have pushed against my snorkel underwater, causing my mask to twist and leak or to completely come off.  When using the Oceanic Snorkel Keeper, I can keep my snorkel in a pocket and then press it on when needed.  It can be pressed on easily underwater or on the surface.

After seeing my friends struggle with their masks and snorkels on a recent trip (they had a quick-release snorkel keepers too, but one took a lot of force to use, and the other was very awkward to use), I purchased the Oceanic Snorkel Keeper for them as well. To install one part of the keeper to your mask strap, unthread one side of the strap, run it through the keep, then rethread the strap back through the mask.  This is a one time installation.

INSTALLATION

To install the corresponding part of the keeper to your snorkel, you can slide the keeper over the top end of your snorkel (you might have to move any deflector or endcap from the snorkel) OR simply pop the keeper directly to the center section of your snorkel by gently spreading the keeper open (the circular part of the keeper has a built-in split).  I used the spread method for multiple snorkels of varying widths and the keeper went on easily yet holds securely.  Although I've never cracked a keeper using the spread method, I recommend only spreading the keeper the minimum amount necessary to get it onto the snorkel.  If you want to be extra cautious, use the slide over the top method.

The easiest way to put on your snorkel with this setup is to put on your mask first.  Next, put the snorkel's mouthpiece in your mouth and feel your way up the length of the snorkel until you find the keeper.  With the same hand, push the snorkel towards the side of your head, towards the mask strap, and feel for the part of the keeper on your mask strap.  Line up the two parts of the keeper with your fingers and press them together.  The heavy duty hook and loop fastener (aka Velcro) holds your snorkel securely to your mask.  This process may sound complicated, but it's really a pretty easy and natural feeling process - a one-handed operation.

To remove the snorkel with the mask still on, feel for the keeper and wedge your fingers between the two halves of the keeper.  The Velcro feels bumpy, but not sharp.

RECOMMENDATION

I have tried about eight quick release snorkel keepers (Aqualung/Seaquest, Mares, Aeris, Dacor, Oceanic, TUSA, and two after-market brands) and two different non-quick release snorkel keepers.  The Oceanic Keeper is by far the best of those I've tried.  At first, I didn't want to pay the higher price of the Oceanic, but it really is a superior product and has added to my enjoyment of both snorkeling and scuba diving.

The product is highly recommended.

Options:
A: very positive
B: positive
C: neutral
D: negative
E: very negative
Answer: A: very positive