Well I have used it and it works pretty well (beat detective too), but the real problem for me is overheads for example snare hits in the OH being out of place with the snare track.
you didn't group the drums.
Stick with Beat Detective - see the "I love Pro-Tools" thread.
you can still edit drums like a mad man without the MPTK. my workflow right now in LE is perfect, and I too mix in reaper after tracking/editing. to edit drums, first GROUP THEM, and then:
1. tab to transient, and snip at every 1/4 note or half 1/2 note transient that you know will quantize right. (you'll get a feel for it quick). do a section at a time, and your result should be a bunch of regions, snipped across all tracks, making a grid of 1/4 note or 1/2 note long chunks.
2. alt+0 and quantize regions. if you snipped at every 1/4 note transient, then quantize 1/4 notes, etc. i've found that because you're quantizing a specific note length, this should be sure-fire 100% every time, once you're good at it. go through and do the song in sections. you tend to be more likely to get mistakes when you snip everything like crazy and try to quantize it all to 16th notes and expect everything to snap into place.
3. after you've quantized, highlight all the sliced regions (still grouped) and bring up beat detective (it doesn't need to be the multi-track) and using edit smoothing, do capture selection, set to fill gaps and crossfade 5 ms (ymmv) and smooth the fades.
4. consolidate, move onto the next section
5. after going through the whole song like this, i go back and make fine-tune adjustments and do fills/technical things with elastic audio. since you've already quantized the easier stuff, none of the stretches will go especially far, and as long as you render in x-form when you're done, the artifacts are extremely minimal, if not undetectable. EA is amazing.
also... yes, get the profire.
...then give it to me.
). 
