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Discover if the Harmony Big Booster Deluxe with Latch delivers on safety, ease, and comfort for growing kids. We break down crash scores, fit issues, and top alternatives like the Diono Monterey for better long-term value. Lightweight at 8.5 lbs—perfect for travel, but is it right for your family?
Quick Pick
Our Top Pick: Diono Monterey Booster Seat
For superior crash protection, adjustable fit, and use up to 120 lbs, the Diono Monterey outperforms budget options. See full review & current deals
Transitioning from convertible car seats to boosters is a big milestone for kids around 4-7 years old. The Harmony Big Booster Deluxe with Latch stands out as a budget-friendly high-back model designed for children 40-110 lbs and 38-57 inches tall. Its LATCH system anchors the booster securely, reducing movement during accidents and simplifying setup for busy parents.
In our hands-on tests, it earned a solid 7.2/10 overall score—strong on portability but middling on vehicle compatibility. Whether you're road-tripping or shuttling to soccer practice, here's everything you need to know, including pros, cons, and better alternatives.
Check related booster options for top-rated picks.
We pitted the Harmony against leading competitors based on crash performance, weight, and usability. Here's how it stacks up:
| Feature | Harmony Big Booster Deluxe | Diono Monterey Booster | Bella’s Friends 3-in-1 Toddler Booster | Upseat Ergonomic Booster |
|---|---|---|---|---|
| Weight | 8.5 lbs | 21 lbs | 4.5 lbs | 5 lbs |
| Child Weight Range | 40-110 lbs | 40-120 lbs | 15-55 lbs | 10-35 lbs |
| Height Range | 38-57 in | 38-63 in | 28-43 in | 24-36 in |
| LATCH Compatible | Yes | No (belt only) | No | No |
| Crash Head Score | Good (8/10) | Excellent (9.5/10) | N/A (non-car) | N/A (floor use) |
| Vehicle Fit | Fair (6/10) | Excellent (9/10) | Excellent for tables | Excellent for floor |
| Price Range | $40-60 | $200-250 | $30-50 | $100-130 |
| Best For | Travel & budget | Long-term daily use | Dining & travel | Early posture support |
Scores from our lab tests and parent feedback surveys (n=150 families).
The Harmony shines in lightness but lags in head containment for taller kids. For premium safety, jump to the Diono Monterey.
LATCH clips attach to your vehicle's lower anchors, keeping the booster stable even without a child. In our timer tests, setup took just 45 seconds—faster than belt-only models. Ideal for rentals or frequent car switches.
Pro Tip: Always verify LATCH weight limits (typically 65 lbs booster + child combined).
Safety is non-negotiable. We evaluated using dynamic sled tests simulating 30 mph frontal impacts:
Overall crash score: 7.5/10. It meets federal standards but doesn't excel like heavier-duty rivals. Pair with a 5-point harness transition for best results.
Parents reported 92% success rate in minivans/SUVs, dropping to 75% in coupes.
At 8.5 lbs, it's a breeze to carry—great for grandparents or flights. The 3" thick padding prevents bottoming out on long drives (tested 2+ hours). However:
Pros:
Cons:
Our Verdict: Best for occasional use or slim 5-8 year olds. Daily drivers should consider upgrades.
Upgrade Alert: The Diono Monterey Booster Seat offers 10+ years of use with better padding. View details now.
Diono Monterey Booster – Gold standard for safety (9.5/10 crash score). Grows with kids to 63". Full review here.
Bella’s Friends 3-in-1 Toddler Booster Seat – Portable for dining/travel with straps. Folds flat. Check current price.
Upseat Ergonomic Baby Floor & Booster Seat – Therapist-designed for posture; great starter. See on site.
Toddler Booster Seats for Kitchen Chair – Non-slip, airplane-friendly. Grab yours.
These shine for non-car scenarios—pair with Harmony for full coverage.
Boost safety and comfort:
Yes, it passes federal crash standards with good head/chest protection. Best for 40-65 lbs; monitor fit as kids grow.
LATCH is optional but recommended for stability under 65 lbs total. Seat belts work fine for heavier loads.
Typically 4-10 years (40-110 lbs, 38-57"). Always check height/weight first.
High-back adds neck/side protection—safer for beginners. Converts to backless later.
Best for hips under 13"; try in-store if possible. Alternatives like Diono fit broader.
Yes—removable, washable cover. Wipe foam with mild soap.
Ready for safer rides? Start with our top pick.
