YES - All brands of min-Quads do have their pros / cons within their engineering design. Or, upgrade items that should be done for one's unique riding conditions. On the Pred-90 line, belt slippage only happens for up to 1 minute - after going through water that's above 1/2 way up its engine. To my son, belt slippage isn't the big deal. The expensive stator replacements and "average construction" frame that gets me going.
As a suggestion, find someone in your neighbourhood and/or local deailers who have practice riding areas. Ask your nephew to take each brand for a little spin, and see what his feedback his. Two of my dealers have hay fields behind their place. Approx 4 times a year (re: after they hay is cut), they allow customers to take the units for a little spin. Their speed control is turned way down, but it does allow someone to take their "possible purchase" for a little road test. If your nephew is the one who will be driving it, he should have a choice in selecting what brand and/or colour he likes best. Likes from an "ease of controls" and riding comfort perspective should always come first. Looks "should" be his last selection to consider.
If you are looking <nobr>for
</nobr>a mini that has the fasted "stock" take off speed, you may want to focus on the LT80. In stock form, I've read many posts stating this brand leaves the others in the dust. However, on rough ground the engine case on the LT80 sometimes breaks. LT80 has has expensive parts - compared to the others. Also, the LT80 doesn't come with a factory front light. Very expensive 3rd party upgrade.
Looks?? Yes, that's a very hard one to overcome. My wife loves<nobr> Ford Mu
</nobr>stangs. She'd purchase another one within a second. After her 3 Mustangs, 4 engines, 3 transmissions, 2 rear axles, 2 complete suspensions, etc. later, she'd still pick this brand again. She loves their style, the way people admire it when she drives it, etc. For me, I run away fro<nobr>m the M
</nobr>ustang line. I'm sure my son feels the same proudness about his Predator 90. Don't get me wrong. The Predator 90 is a really great brand. Just keep it away from deep water and exteme rough bumps (unless your re-enforce its frame).
If I had a choice again, I'd set my microscope on the Kasea, BLAST/LRX & E-Ton brands. From there, pick which one you like the best. Then, upgrade the parts you need for your unique riding conditions (or better safety / controls).
Hope my above "try to take each brand for a test ride" suggestion helps as well.
Also, when you type something using capitals on the internet it means that you are YELLING at someone. Based on your friendly tone, you probably aren't aware of this. If the future, you may want to use small size text and only use caps when you want to emphasize something.
Hope this helps as well...