Hi Chris
There are may hollowing tools on the market as I am sure you have found out. To start with I am sponsored by, and sell Crown tools so obviously it can be said I am biased
The Munro is an excellent tool, very well made and excels at end grain wet hollowing, it can also be used on dry wood. For cross grain turning of seasoned woods you will be best with a scraping cutter especially in confined spaces and hard seasoned knarly woods. The Revolution comes with these where as for the Munro you have to purchase separate cutters on top of the price, with the Revolution you get numerous scraping cutters and a finishing scraper plus a second ring cutter, within the one price.
Ed, Crown have a life time guarantee on all their tools so if you are having issues just let me know matey and I can get some new parts sent out to you FOC to sort out any issues. Personally I do not have this issue and I hammer my Revolution, again, of course people will say I am going to say this.
In relation to the screws getting clogged, yes this can happen, to get over this I keep an old dart head to clean out the screw heads before unscrewing as if the shavings become compact in the heads you can round them off.
Alternatively the links can be unscrewed and turned upside-down so the heads are at the bottom, voilà no issue.
Finally again I clarify that the Munro is a very good tool, but for the money the Revolution offers a versatile well priced option for covering a cross range of hollowing and box projects in both end grain cross grain seasoned and wet woods, but of course I will say that.