Yes, an urban planter box with an attached trellis can be worth buying if you want to grow climbing plants in a small space without adding separate stakes or a wall-mounted frame. The main advantage is convenience: the planter and support come as one unit, so you can place it on a balcony, patio, or courtyard, fill it with soil, and plant peas, beans, cucumbers, clematis, jasmine, or other climbers. The vertical design saves floor space, adds greenery at eye level, and can create a little privacy screen. It also looks tidier than a collection of loose pots and bamboo canes.
However, it is only worth it if the planter is well designed. Check the soil volume, because climbing plants need enough root space to grow well. Look for good drainage holes and a saucer or drainage system that will not flood your balcony. The trellis should be firmly attached and tall enough for the plant you choose; a weak or short trellis will quickly become useless. Since a planted box with a trellis can be top-heavy, choose a sturdy, weather-resistant material and secure it against strong wind, especially on high balconies.
The downsides are limited flexibility and weight. A large integrated planter is harder to move than separate pots, and the trellis may be too small for vigorous climbers. Cheap models can rust, rot, or wobble. Before buying, measure your space, check the load limit of your balcony, and think about whether you need a detachable trellis for cleaning or seasonal storage.
Overall, it is worth buying for urban gardeners who want a compact, tidy vertical growing setup and are willing to choose a sturdy, well-drained model. It is less suitable if you need maximum harvests, grow very heavy climbers, or move your plants often. Pick a good-quality planter with a strong trellis, and it can be a practical and attractive addition to a small outdoor space.