Almost every single simulator package is going to require a computer to run its software. Hardware is an added cost that many golfers will not consider. It’s possible you may already have a laptop, tablet, or desktop option that is capable of running the software. Most systems will require a more robust graphics card, which you can easily upgrade on an older computer if you are handy.
I love this thing! I can play 18 holes anytime I want, rain or shine. Couple of points; Putting not so great but once you get the hang of it, not so bad either. I would recommend using the long/short tee on every shot. While it's pretty sturdy in the base, metal, the housing is plastic and the first one I had shattered on a miss hit by one of my friends who did not use a tee. Lesson learned. Excellent feed back on swing speed, plane and face position at impact. really has helped me correct some minor issues. I bought a Rukket 10x7ft Haack Golf Net (great product!) and use it indoor. You can swing without a golfball, of course, but I like the feel of the ball on the club face. What can I say, I've played 18 ... full review

In summary, if you are a beginner and looking for a budget-friendly golf simulator that will allow you to take some swings indoors, or for those who just want to have fun and load up Tiger Woods to play with friends, then this simulator will be perfect for you. Of course, there will be instances in which shots don’t register or your get inaccurate distances, but that’s what the included remote is for. Just reset and swing again! This unit is extremely portable, and you can hook it up anywhere on a USB device.
Here is another option from the same company, and it is offering a bit more at a higher price point. It’s under $1,000, which puts it in quite a few people’s budgets, but you need to understand what you are getting for the price. The mat, net, scoring equipment and other included components do an excellent job of helping you to practice, but this is considered a budget product, and you should realize that going in. It will last, but it won’t offer all the features of something that you would pay more than $1,000 for.
If you are using a projector, then you will need an impact screen. The price can vary anywhere between $250 to well over $1000, depending on the quality and design. Here is an excellent option if you are on a budget. Depending on the room you are using, you also should consider putting netting around the perimeter of the impact screen for any errant shots.
Comprehensive Measurement: We measure ALL the critical club & ball parameters to analyze exactly what’s happening each time a golfer swings. There are, at minimum 4 cameras capturing your swing. They analyze club head speed, launch angle, swing path, club contact (heel/toe), club face (open/closed), efficiency, smash factor and a specific camera dedicated to measuring spin and spin-axis.
We anxiously wait as the snow melts and the ground dries to take the first few hacks of the Spring.  Then with regular playing over the course of the Summer we actually look competent out on the course, just in time for October to hit and the clubs to get shelved for another six months.  Trouble is that the time next Spring arrives we’ve lost all the gains that were made last year and it’s just like starting over.
Up to this point you probably have about $800-$1,000 wrapped up in the OptiShot and your projector along with another $300 if you’ve built a permanent enclosure, but luckily those represent the last of the major purchases for your home golf simulator.  The rest of the items used in the simulator can be purchased at your discretion to maximize the feel of a real golf outing.
Although the infrared sensors are the Optishot’s main features, it might not be enough for the experienced golfer. The reason is that this device will not measure the golf ball like many other systems out there. You’ll likely make a great shot every single time you hit the ball because OptiShot does not take into account gear effect and therefore doesn’t track the ball.
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