From all I have read (the Borka wrench and several others have been discussed quite a bit on Rimfire Central, most recently here:
http://www.rimfirecentral.com/forums/showthread.php?t=747457 and the Borka seems to have a quite loyal following), the Borka does just fine, especially if you desire a compact wrench with lots of drivers for your range bag.
Do not get too concerned about torque wrench accuracy though, only repeatability - if you have the facilities to measure the actual preload when you apply a specific torque (such testing isn't cheap; I had access to such facilities and funded a lot of such testing, consuming about $250,000 of my employer's money over about ten years, mostly to establish average friction coefficients with different thread lubes and bolting material combinations) you will find the results a bit hair raising if you don't have prior knowledge. In a statistically valid sample (10 nuts and bolts is fine) on the best day of your life, you will find that the preload variation is on the order of 32%-35% from the highest to the lowest, and that's with all bolts from the same manufacturer's lot, all nuts from the same manufacturer's lot, the same torque wrench, and an experienced technician using a properly structured tightening procedure applying the torque with a torque wrench with a current calibration certificate. It is not unheard of to find a 100% variation (the highest preload twice the lowest preload), although fortunately that doesn't happen too often if proper procedures are followed. The culprit is not the torque wrench, but small manufacturing variations in the threaded fasteners themselves; these small variations in dimensions and surface finishes (even within the same lot) cause the variation in preload from fastener to fastener when the same torque is applied to all. In the list of things that can effect preload noticeably (about 76 items unless you want to break the outline down to minute detail, which jumps it to well over 200 items), the preload inaccuracy due to the torque wrench inaccuracy (which is generally a consistent error - nice to have a small blessing) is down in the weeds - take it away and it won't change the results as much a bunch of other factors.
If you use motor oil for a thread lube, you should use the same torque as you would use for dry threads, because motor oil does not have the right type of pressure additives to make a significant difference in preload versus dry threads when the fasteners are actually being tightened, as opposed to simply running free until contact is made with the clamped material. To give you an idea of how this can cause some humorous results, you can test the same size fasteners from two different manufacturer's lots and if there is a significant difference in surface finish (not necessarily visible to the naked eye), the unlubed lot can give a slightly lower average preload with application of the same torque than the lot lubed with motor oil or axle grease - been there, had it happen.
I'm going to stop here as at least three of the items I've alluded to above each get their own chapter in books on threaded fastener technology, and I don't want to write another chapter...