Hi Mike...i've like to give my fair bit on this...
When i first got my TDM,i was using GIVI wingrack with GIVI 45ltr panniers.this cost around SGD$700
GIVI

TDM with the boxes

Riding with the boxes

Rack alone on the TDM
That was almost 3yrs ago...used that for about 1yr.
Plus points.
1.can storage quite alot of stuffs.inclusive 1 FF helmet and one open face helmet or 2 open face helmet.
2.It could be transfered to use as a top box.
Not so good points.
1.Water sipped in at the end of 1yr using it but i believed twinrider has said that the seal at the side can be replace
2.Don't look so good as panniers IMO.
After sold the GIVI,i turned to H&B junior.This would cost SGD$950 inclusive of racks and 1 pair of Junior 40ltr.
H&B

TDM with the H&B panniers

H&B racks on the TDM

Rider+TDM+H&B
Plus point
1.very strong and rugged
2.1 side of pannier can store 1 full face and raincoat.
3.Looks great with panniers or just racks only.
4.Don't need to use the key everytime you need to open the pannier.
Not so good point.
1.my friend which has the same H&B panniers,his pannier key are able to unlocked my pannier...yikes.
2.panniers cant be use at topbox like the GIVI.
Next after H&B,i got an offer from a good friend from Kuala Lumpur selling me the Yamaha panniers..i've always wanted to have those...but its too expensive here...a pair of panniers and racks cost SGD$1800.1 side pannier able to store FF helmet.
Yamaha

Slightly wider than H&B


TDM+yamaha panniers.

Comparison between H&B and yamaha

TDM with yamaha sideracks.
Plus points.
1.looks great.
2.Your TDM will never feel left out when side by side with ST,RT,FJR..hehe
3.Looks great too without the panniers...your bikes feel naked.
Not so good point
1.Need keys to open every time
2.Lock design crappy.easy to peel the box open.
3.Freaking expensive.
Lastly and currently,
i am using the Hepco&Becker alu 41ltr.Suits my needs.More stronger than any of those above.Bike fall during let it stand on its on due to soft ground.the cases don't feel any pinch.once i bang it on a Big Truck driver mount legde during me squeezing through traffic.Its a massive bang i swear.but the damage,makes me laugh..just a small dent.Price of the panniers.SGD$800 without racks
The racks was modded because i need it to be lower position than the original H&B sideracks.


and i did said it fall at the side.



Plus points.
1.Very very strong
2.Can fill with loads of goodies in.
3.Looks rugged
4.no need keys to open panniers all the time
5.open from the top
Not so good points
1.wont have the exclusive feelings of the TDM when side by side with ST,RT,FJR
2.can't fit FF helmet
3.have to mod the sideracks.
Hope this infos helps...
Cheers.
AJ