I know it is an old thread but in case anyone reads this and is thinking about getting one here is my experience.
We have three in my school and they are without a doubt my most used piece of training equipment. I teach in a Rec. Center so I can't have hanging bags and I have to use the free standing type.
I have 2 of the Kid kick WMs, 1 Powerline Original WM, 3 WMXXls in my room at the Rec. Out of the 3 WMXXls I have only had problems with one and that was due to someone coming in after hours un screwing the base and then beating on the WMXXL (probably they unscrewed it when moving it and not realizing it then beat on it) and they then tried to correct the problem by unscrewing it more and cross threading it back in and beating on it again thereby breaking the top and costing me roughly $300.00.:erg: That same base might have dripped out a few drops of water when it was moved around but that was it. The other two have held up well. I teach multiple classes per night, from kids to teens, 4 times per week and they are used several times each night being rolled onto and off of the mat.
Pros
- While my oldest teenage student can knock it over with a well place side kick for the most part unless the students are doing running and jumping kicks they get rocked back, but don't go over. However having the younger kids do running and jumping kicks trying to knock it over is a great way to end class on a high note, also it is a great confidence builder, as well as a retention tool for the classes.
- The base unlike the Powerline WM (an original WM with a Powerline top) is lower so even my students (ages 6-7) can get their little legs up and kick the bag, the WM has a taller base and it is harder for the young beginner kids to kick that high. Believe me you don't want little Johnny all of the sudden to cry out OWWWW! because the lost concentration and kicked the hard base. Terrible for retention. This is a reason I always have to remind the kids "Ok kids what part of the bag do we hit?" "The top" "Do we hit the base?" "Noooo" "Why not" "Because it hurts".
- The WMXXL weighs about 150-170lbs with water in it so it is solid enough to take good punches, and kicks, and yet it rolls easy on and off of the mat.
- As a teacher it is a very versatile training tool in class, I have kids using it from 6 yrs old through Adults. We hit the bags with Nunchaku, Tonfa, Jo, escrima sticks, etc. etc. in addition to the flying kicks etc. etc.
Cons
- The base rocks back and then slams down to the ground. This is a concern of mine for the younger kids especially, you don't want any toes getting under that base. When the students are in their early teens (or younger with the jumping kicks) they have enough power to rock the WMXXL back (not enough to knock it over but...) enough to rock the front of the base up off of the mat. In seven years of using them we've never had an issue with toes getting under the WMXXL but it is something that I watch like a hawk in class.
- Because of the design and with the base rocking backwards I don't use it to train/teach elbows with because the feet are so near the base. I've tried to find a method of teaching a particular strike elbow that the students don't like to hold pads for. However the WMXXL (any of the WMs for that matter) the base is two wide for that strike without the fear of getting the feet under it. Likewise same goes for leg kicks as well for practicing on the WMXXLs and certainly on the WMs.
For my money I would recommend the WMXXLs over the original designed WMs (including the Powerline models). Also Century now also has the WMXXL Pro their redesigned WMXXL with a different base that might correct or help with some of the issues of the base rocking back. HOWEVER they list for around $100.00 more than the WMXXL. The WMXXL is being phased out and only the WMXXL Pro is now listed in the catalogs but they can be ordered from the company.
In regards to sand vs. water
I need the WMs (all of them) to be able to move; since I have limited mat space, they are moved several times per night. I have placed water in them since they are easier to move. In another school that I have filled in as a guest instructor they have filled their original type WM with sand and it is planted, I don't think it has moved from it's spot in the past 3-4 years. I tried to move it onto the mat for the students to kick and it wasn't worth the effort. I'll take being able to have the WM rock back and even be knocked over in a trade off for maneuverability.
In regards to shipping and handling.
Be aware that Century does charge a $25.00 over sized box fee and then shipping charges on top of that. Sometimes they offer specials where you don't pay for shipping but you have to catch them at the right time. I have never had to order a base separately.