The Shimano R540 is a great option if you don't want to spend a lot of money to get a dependable set of pedals. What you get are a practically indestructible set of pedals from the largest manufacturer in the business, and for not a lot of money!
The downside to these pedals is that they're a little heavier than other options, and sometimes they're sticky getting in and out of them. For the most part, especially if they'll be your first pedals, you will have made a solid choice going with this pedal from Shimano. You can dial in the amount of tension on the binding for a custom feel. You also get a proven, dependable pedal body and spindle that will last for years and/or thousands of miles.
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Weighing in at 336g, these pedals aren't obese, but they aren't the lightest option, either. The ride with these pedals is very similar to the ride with other pedals--the difference is clipping in and out.
What you need to know about these pedals is basically this: they are the lowest budget option from Shimano, but they are built to last and will perform solidly for miles and miles.