MRP Lopes SL here for a year or so now. It’s expensive for what it is, and the plastics are a little fragile so be careful when setting it up or adjusting it, but not lost the chain once whilst running it.
Had an E13 LG1 on another bike before this, similar story as it just didn’t drop the chain either. Though I remember it being a big PITA to setup right in comparison the the MRP, but that might just be me.
Tempted by the MRP Mini G2 though myself as it’s essentially the Lopes but with a bit more material on it in places it might be useful…
Without wishing to sound all “GW” on you (though I undoubtedly will, and he’ll agree with me also), but top only guides really don’t work very well in the rough tough world of mountain biking. Not if you’re riding at all hard and fast… How many DH bikes do you see with a top only guide for instance?