What They Have in Common
Both use Doppler radar, work indoors and outdoors, and track the core metrics most golfers care about: carry distance, ball speed, launch angle, smash factor, spin rate, and apex. Neither requires club face stickers. That's about where the similarities end.
Where They Differ
What You're Actually Paying (Total Cost of Ownership)
The MLM1 is $249.99 up front, but the features most people buy it for — shot tracer, slow-motion video, R-Speed — are locked behind a $99.99/year subscription. At three years: $549.96. At five years: $749.95. The SC4 PRO is $599 up front with no subscription. At three years: still $599. At five years: still $599.
If you're planning to use this thing for more than two years, the SC4 PRO is cheaper. That's not editorializing — that's math.
Special Ball Requirements
The MLM1 requires RCT (Radar Capture Technology) balls for spin data. Without them, you're getting estimated spin numbers that I'd treat skeptically. RCT balls run around $70 a dozen, so if you practice weekly and burn through a sleeve or two, budget an extra $100–$200 a year on top of your subscription. The SC4 PRO works with any ball, no caveats.
Built-in Display vs. Phone Dependency
This is the practical day-to-day difference most reviews underweight. The SC4 PRO has a built-in LCD and reads your distance out loud. You set it up, hit balls, hear the number. Your phone can stay in your bag.
The MLM1 requires an iPhone — no Android support — running and connected the whole session. If you're at a range with bright sun, you're squinting at a screen. If your phone battery's at 30%, you're making decisions. If you're an Android user, stop reading; the MLM1 isn't for you.
Battery Life
Ten hours on the SC4 PRO. The MLM1 gets about four hours — which is probably fine for most range sessions, but the SC4 PRO wins by a lot here. If you're doing an extended practice day or a simulator session that runs long, that gap matters.
Simulation and Software
The SC4 PRO includes five E6 Connect courses for free. Not a trial — included. If you want more, E6 Connect subscriptions are available, but you're not forced into anything. The MLM1's free tier gets you basic shot tracking; the Virtual Range feature and anything worth using for sim-style practice requires the paid subscription.
Data Depth
The MLM1 adds launch direction and side carry to its metric list, which the SC4 PRO doesn't explicitly track. For someone dialing in a push-fade or trying to understand dispersion patterns, that's genuinely useful data. The SC4 PRO adds spin axis, which tells you about sidespin orientation. Both cover the fundamentals. Neither is obviously superior here — it depends on which metrics you actually look at.
Who Should Buy Which
Get the Rapsodo MLM1 if...
- You're an iPhone user (non-negotiable — Android users, move on)
- You're on a tight initial budget and $249 is your actual ceiling, understanding that you'll likely need the $99.99/year subscription to get full value
- You want shot tracer video and swing replay — the MLM1's camera integration with your iPhone makes this genuinely compelling for self-coaching
- You hit the range twice a week max and won't blow through RCT balls fast enough for it to matter financially
- You don't mind babysitting your phone setup before each session
Get the Swing Caddie SC4 PRO if...
- You practice regularly and plan to keep this launch monitor for two-plus years — the subscription math works against the MLM1 over time
- You want to leave your phone in your bag and just hit balls — the built-in display and voice output make sessions genuinely frictionless
- You use an Android phone, or just don't want your phone involved at all
- You already have a golf ball preference and don't want to switch to RCT balls or absorb that cost
- You're interested in dipping into E6 Connect simulation without committing to a subscription first
The Bottom Line
The MLM1 looks like the obvious choice at $249, but once you add two years of the subscription you'll probably want, you've spent more than the SC4 PRO costs outright — and you're still using RCT balls and tethering to an iPhone. If the video and shot tracer features are the reason you're looking at the MLM1, great — those are real differentiators. But if you just want accurate distance data and a launch monitor that disappears into your routine, the SC4 PRO is the easier device to own.
Get the Swing Caddie SC4 PRO.
See Also