I've purchased quite a few IGT pieces from both Stanluck and SP, and I've been very impressed with Stanluck's quality across all of their lines - frames, accessories, tops, and extensions. Further, Stanluck has really pushed innovation forward for IGT in those lines.
The frame is excellent quality and I've found nothing to criticize in terms of finish, tolerances, and quality control. It comes packed very securely, fully wrapped in air cushion packaging. The legs have a comforting heft to them, fit very securely into the frame, and the extendable option is well worth the premium to standard SP IGT legs. In particular, I've found the 550mm height to be a really great option for a seated height - 660mm will fit a standard folding/dining chair underneath with your legs, but 400mm tends to be a little lower than I like, even for a camp chair. I love that Stanluck provides this middle ground option, as it has proven the most comfortable for me and my family.
Regarding the accessories that come in this bundle, the deep collapsible mesh basket is one of my favorite Stanluck accessory options - it folds down completely flat, making it easy to pack and store vs it's metal mesh counterparts. It also includes an internal metal base, which is optional to install, but provides the basket with great structure.
The half unit metal boxes are a pretty standard inclusion in both Stanluck and SP bundles, however, these are my least favorite part of the kit. They don't nest, so storing them at home or packing in the car tends to take up a lot of space. However, I do like the half unit metal covers, and would use those even without the boxes to provide some space around my burners.
The bamboo 2 unit insert is a good quality, but I've found the color to be slightly darker than my table extensions from both SP and Stanluck - not enough to really stand out, but a small note.
Finally, the 4-unit deluxe storage bag is an awesome addition and I've ordered a separate one for my other 4-unit IGT frame. It easily stores the frame, the collapsible legs (up to 10, so 5 sets), a middle layer for a full 4-unit table or angled pieces, another middle layer with straps for the bamboo sliders, pockets for a 1-unit piece and a 2-unit piece (like your 2 unit bamboo insert), and then even another upper layer if you want to add anything else in. The bag becomes quite heavy when fully loaded, but still remains very thin. It's shocking how much it can hold. The straps have very heavy duty stitching and good connection points, so I don't have concerns about tearing the fabric. The zipper is large and heavy duty, so that inspires confidence as well.
Overall, I ordered both an SP bundle and Stanluck bundle, and returned the SP bundle after seeing the quality and innovation that Stanluck is putting forward. Hopefully, that helps others who may be trying to make a similar decision - there was surprisingly little in the way of comparisons both on Reddit and Youtube, hence my own experiment. Happy camping!